Offshoreonly.com
Page 4 of 10
« First
2
3
4
5
6
Last »
Show 40 post(s) from this thread on one page

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   What's wrong with AFR's exhaust port? (https://www.offshoreonly.com/forums/general-q/323534-whats-wrong-afrs-exhaust-port.html)

MILD THUNDER 03-03-2015 05:05 PM
Originally Posted by mike tkach (Post 4273430)
bb,i think top fuel is 500 inch limit unless they changed it.the nitro engine gets by with the smaller port because the nitro methane has it,s own oxygen,not relyant on oxygen from the air.i believe they only run the nitro engines to around 8000 rpm.
And the fuel introduced into the cylinder, is nearly 90% liquid state, 10% vapor. The reason they run so much lead, is they have to light that charge off very early to get the explosion of the vapor to burn all that fuel. Crazy stuff. One cylinder worth of fuel consumption on 1 pass. :cool-smiley-011: https://www.youtube.com/watch?v=xGTbQuhhluY

SB 03-03-2015 05:40 PM
Originally Posted by mike tkach (Post 4273430)
bb,i think top fuel is 500 inch limit unless they changed it.the nitro engine gets by with the smaller port because the nitro methane has it,s own oxygen,not relyant on oxygen from the air.i believe they only run the nitro engines to around 8000 rpm.
Very different as they run enough fuel on the verge of hydrolocking. Fuel takes up air space. And yes, they run massive amt of air thru the blower too. So I've heard, obviously I have no hands on with this.

I have not read about port sizing...I would think it would be very large cross sectional area with all that fuel and air. If you have a link I would love to read about it...very fascinationg stuff of course.

Black Baja 03-03-2015 06:13 PM
Originally Posted by mike tkach (Post 4273430)
bb,i think top fuel is 500 inch limit unless they changed it.the nitro engine gets by with the smaller port because the nitro methane has it,s own oxygen,not relyant on oxygen from the air.i believe they only run the nitro engines to around 8000 rpm.
Rail 500" Funny Car 525"

They have injectors in the hat as well as in the cylinder. Really the only way to make BIG power is to run a dry port and inject into the cylinder. It's funny I was just having a conversation with someone about direct injection. I had some experience with a motor in the past that couldn't make any power injected on alcohol (wet runner) wouldn't go over 1300hp. Injector went in the trash for some out of the box gas Quick Fuels and it went over 1600 first hit on the dyno. This was a N/a billet headed deal.

abones 03-03-2015 08:20 PM
Originally Posted by Black Baja (Post 4273288)
You know I was thinking about your previous post and about using the larger than optimal intake port and how it you said it still makes good power with the right blower what Darin said about the Pro-mod engines. You know top fuel is the limit. There is nothing more powerful. They run a 525ci motor. About 2 years ago I was in a friend shop and he said let me show you something (it was a top fuel head) I checked that thing out from top to bottom. I couldn't believe how small the ports were I mean with that kind of power and boost I would think you would be able to drive a tractor trailor through them. Surely not. I've worked on Nitrous Pro-Mod stuff been elbow deep in the motors I know what kind of port it takes to support 865ci and 9000rpm (tractor fits). But the top fuel stuff is small. I guess the theory of sizing the port to the cubic inch and rpm applies no matter what's on top of it or what kind of fuel its burning.
I have always been amazed at what a good cyl head man can do to get the most out of your individual motor with the combination of parts, CR, and induction. each engine has different flow requirements. I always enjoy talking with Steve Sanchez at (Total Flow Products) about the latest in technology when I drop off or pick up my heads from him. He freshens up my heads every 3 seasons as PM. he does top fuel, top alcohol. I would recommend him to any serious engine enthusiast! his mentor Warren (Butch) Elkins ported my heads 15 years ago and Steve has been updating them since. These guys are worth the money in my opinion!

mike tkach 03-04-2015 08:18 AM
Originally Posted by Black Baja (Post 4273464)
Rail 500" Funny Car 525"

They have injectors in the hat as well as in the cylinder. Really the only way to make BIG power is to run a dry port and inject into the cylinder. It's funny I was just having a conversation with someone about direct injection. I had some experience with a motor in the past that couldn't make any power injected on alcohol (wet runner) wouldn't go over 1300hp. Injector went in the trash for some out of the box gas Quick Fuels and it went over 1600 first hit on the dyno. This was a N/a billet headed deal.
just fyi,the nhra rulebook sais top fuel&funny car min cu in 490-max 500.from the 2014-2015 rulebook.

Black Baja 03-04-2015 08:33 AM
Originally Posted by mike tkach (Post 4273694)
just fyi,the nhra rulebook sais top fuel&funny car min cu in 490-max 500.from the 2014-2015 rulebook.
I could be going off of 20 years ago :-)

Full Force 03-05-2015 07:15 AM
Originally Posted by offshorexcursion (Post 4272223)
The pro comp head can be worked to flow good numbers.

IMO the cheap casting can not reliably handle a lot of power though.

Even with the best parts installed, shaft rockers etc, the casting will fail.
Thats why I sold mine, I spent 2600.00 making them right, was worried about durability in the casting at 650 plus HP, so I sold them.

adk61 03-05-2015 08:18 AM
2 Attachment(s)
[ATTACH=CONFIG]537975[/ATTACH][ATTACH=CONFIG]537976[/ATTACH] was chatting with my buddy Jeff Arend this am and he confirmed what the scoop is in Fuel Funny Car ... 8500rpm at the hit and on a good run 81-8250 out the traps ... 500 cubic inch limit 1000' track

adk61 03-05-2015 08:24 AM
1 Attachment(s)
[ATTACH=CONFIG]537977[/ATTACH] this was me back in the early 90's falshback Thursday!! sorry for the sidetrack guys... Funny Car topic made me stray!!!

the deep 03-05-2015 06:09 PM
Someday in the future , a man like myself that is researching Air Flow Research heads in particular the 315's for his build , needs to see these pics . Got a present from Marine Kinetics today and took these pics straight out of the shipping box . A picture does speak a thousand words !!! Straight down the exhaust port with an Inconal Tulip Valve at the bottom .

http://i1243.photobucket.com/albums/...t/100_0993.jpg

http://i1243.photobucket.com/albums/...t/100_1002.jpg

Combustion chamber almost looks hand polished .

http://i1243.photobucket.com/albums/...t/100_0997.jpg

http://i1243.photobucket.com/albums/...t/100_1004.jpg

Intake side of things .

http://i1243.photobucket.com/albums/...t/100_0994.jpg

And I wanted to add that only a top notch company would package their product in such a manner to protect it from careless UPS employees . The damage shown here would have surely resulted in a damaged aluminum head .

http://i1243.photobucket.com/albums/...t/100_1009.jpg

http://i1243.photobucket.com/albums/...t/100_0998.jpg

http://i1243.photobucket.com/albums/...t/100_1001.jpg

http://i1243.photobucket.com/albums/...t/100_1000.jpg

sutphen 30 03-05-2015 06:33 PM
yup,,afr has great packaging.our ups driver doesn't do that kind of damage.:D

the deep 03-05-2015 06:49 PM
Originally Posted by sutphen 30 (Post 4274485)
yup,,afr has great packaging.our ups driver doesn't do that kind of damage.:D
I think somebody was pissed at the 70 lbs . Box looked like it had bacca spit on it too . :angry-smiley-038: Makes me wonder if these went through Michigan on the way here . http://i1243.photobucket.com/albums/...thedeep/19.gif

Black Baja 03-05-2015 07:21 PM
Originally Posted by the deep (Post 4274472)
Someday in the future , a man like myself that is researching Air Flow Research heads in particular the 315's for his build , needs to see these pics . Got a present from Marine Kinetics today and took these pics straight out of the shipping box . A picture does speak a thousand words !!! Straight down the exhaust port with an Inconal Tulip Valve at the bottom .

http://i1243.photobucket.com/albums/...t/100_0993.jpg

http://i1243.photobucket.com/albums/...t/100_1002.jpg

Combustion chamber almost looks hand polished .

http://i1243.photobucket.com/albums/...t/100_0997.jpg

http://i1243.photobucket.com/albums/...t/100_1004.jpg

Intake side of things .

http://i1243.photobucket.com/albums/...t/100_0994.jpg

And I wanted to add that only a top notch company would package their product in such a manner to protect it from careless UPS employees . The damage shown here would have surely resulted in a damaged aluminum head .

http://i1243.photobucket.com/albums/...t/100_1009.jpg

http://i1243.photobucket.com/albums/...t/100_0998.jpg

http://i1243.photobucket.com/albums/...t/100_1001.jpg

http://i1243.photobucket.com/albums/...t/100_1000.jpg
Man those pics almost make me want to pull my 385's out of the box that's been sitting in my living room for a month.

the deep 03-05-2015 07:25 PM
Originally Posted by Black Baja (Post 4274514)
Man those pics almost make me want to pull my 385's out of the box that's been sitting in my living room for a month.
Definitely look better in the living room out of the box . :cool-smiley-011:

Full Force 03-05-2015 08:36 PM
3 Attachment(s)
Got my AFR yesterday, Same quality, I did CNC chamber not full port, but extremely happy with product and the way they were bolted down inside box..

[ATTACH=CONFIG]538076[/ATTACH][ATTACH=CONFIG]538077[/ATTACH][ATTACH=CONFIG]538078[/ATTACH]

Randy Nielsen 03-05-2015 10:05 PM
3 Attachment(s)
[ATTACH=CONFIG]538079[/ATTACH][ATTACH=CONFIG]538080[/ATTACH][ATTACH=CONFIG]538081[/ATTACH]A few pics of my new AFR's

Black Baja 03-06-2015 05:25 AM
Originally Posted by Full Force (Post 4274551)
Got my AFR yesterday, Same quality, I did CNC chamber not full port, but extremely happy with product and the way they were bolted down inside box..

[ATTACH=CONFIG]538076[/ATTACH][ATTACH=CONFIG]538077[/ATTACH][ATTACH=CONFIG]538078[/ATTACH]
That's a pretty good looking cast port.

MILD THUNDER 03-06-2015 10:25 AM
When you buy the AFR heads ready to bolt on, are the guide clearances and seat widths set up for marine/marine supercharging ?

the deep 03-06-2015 11:39 AM
Originally Posted by MILD THUNDER (Post 4274756)
When you buy the AFR heads ready to bolt on, are the guide clearances and seat widths set up for marine/marine supercharging ?
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .

MILD THUNDER 03-06-2015 12:44 PM
Originally Posted by the deep (Post 4274799)
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .
That seems a little tight for a marine supercharged setup esp running cool water temps . Id be a little worried about being that tight, especially if your engine isnt thermally stable. If your on the cold side of water temps, that may exacerbate the issue. Also, inconel valves are great but they still need a wide seat to aid in cooling the valve .

My next set of heads I will be buying bare and having my head guy assemble them, check guide clearances, check valve job ...

abones 03-06-2015 03:57 PM
Originally Posted by MILD THUNDER (Post 4274815)
That seems a little tight for a marine supercharged setup esp running cool water temps . inconel valves are great but they still need a wide seat to aid in cooling the valve .

My next set of heads I will be buying bare and having my head guy assemble them, check guide clearances, check valve job ...
Correction Joe, It sould read my next SETS of heads.. .. and Chamber work! Carry on.

ICDEDPPL 03-06-2015 05:27 PM
Originally Posted by the deep (Post 4274799)
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .
I trust my guy @ High Flow heads to set em up for my application but I also like Teague and the way they set up their heads for blown applications.


Why settle for less? Bob Teague spent some time at the ARF factory and helped develop a program for what we like to call a true HIGH PERFORMANCE CNC MARINE HEAD.
All the heads in stock are madewith 3/8 exhuast valves instead of 11/32 because we think that the thicker valve stem is much stronger especialy for the punishing heat and rpm most high performance motors make.
With this CNC program you get THICKER VALVE SEAT WIDTHS for more surface area to transfer heat.
A chamber of 124cc instead of 121cc, the bigger chamber drops static compression so you can run more boost and the custom chamber design also picks up exhuast flow to make more power on blower motors.
So as you can see by some of the things we do different on our CUSTOM CNC AFR HEADS from the AFR heads you can buy somewhere else you not only get a much stronger set of heads but a more POWERFULL set of HEADS.
These are the same heads that we use on every motor we build and they are available to you. Why settle for less ? There is no reason, just buy the best...........
I have them in stock



http://www.offshoreonly.com/forums/n...ine-heads.html

KAAMA 03-06-2015 06:22 PM
Originally Posted by the deep (Post 4274799)
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .
We ordered my AFR fully cnc'd heads bare. Before Dave W assembled the heads, the first thing he does is measure everything on the heads. He said the valve seat concentricity on my heads were right on, but he said the valve guide clearances were a little too tight and he had to ream/hone them to the tolerances he likes for a marine hi-perf engine. We used titanium retainers w/the machine hardened locks, spring locators, hi quality Isky springs installed with 250lbs on the seat----they're in plastic bags ready to be installed on the blocks....we're waiting on the solid cams to be shipped in from Bob M.

the deep 03-06-2015 06:41 PM
Vgc can be easily addressed but what I want to know is how much for that polish job . :drool1:

http://www.offshoreonly.com/forums/a...ads-bottom.jpg

mike tkach 03-06-2015 08:26 PM
to answer the op,s question,NOTHING!

14 apache 03-06-2015 08:31 PM
Originally Posted by the deep (Post 4274980)
Vgc can be easily addressed but what I want to know is how much for that polish job . :drool1:

http://www.offshoreonly.com/forums/a...ads-bottom.jpg
Hookers work cheap to polish heads!. :noevil:

mike tkach 03-06-2015 08:34 PM
i recently had my crank polished!

14 apache 03-06-2015 08:40 PM
Getting your crank polished is good but the cost is heavy.

F-2 Speedy 03-06-2015 08:42 PM
Piston depth 10 in the hole :D

14 apache 03-06-2015 08:43 PM
Originally Posted by mike tkach (Post 4275011)
i recently had my crank polished!
From a hooker?

14 apache 03-06-2015 08:43 PM
Originally Posted by 33outlawsst (Post 4275016)
Piston depth 10 in the hole :D
God dam your blessed!

14 apache 03-06-2015 08:45 PM
Originally Posted by 33outlawsst (Post 4275016)
Piston depth 10 in the hole :D
Hole # 1 :hitfan:

the deep 03-06-2015 08:46 PM
Originally Posted by 14 apache (Post 4275014)
Getting your crank polished is good but the cost is heavy.
I'll drink to that !

http://i1243.photobucket.com/albums/...S/100_0538.jpg

SB 03-06-2015 08:54 PM
Originally Posted by mike tkach (Post 4275011)
i recently had my crank polished!
Leaf Blower crank or .............. ?

mike tkach 03-06-2015 09:06 PM
Originally Posted by 14 apache (Post 4275017)
From a hooker?
xxx:eek:

KAAMA 03-09-2015 09:49 AM
I thought this link given by Artticfriends/aka "Smitty" from a few years ago in a different thread is a very informative link with the flow data from all kinds of various heads, with different flow benches, etc...w/pipe and without....including all the AFR/Air Flow Research heads as well.

http://users.erols.com/srweiss/table...hevy_Big_Block

adk61 03-09-2015 10:07 AM
Originally Posted by 14 apache (Post 4275018)
God dam your blessed!
surprised he didn't pop out the other end!!! lmfao :lolhit:

adk61 03-09-2015 10:08 AM
Originally Posted by 33outlawsst (Post 4275016)
Piston depth 10 in the hole :D
:bananalove:

brian41 03-10-2015 03:57 PM
3 Attachment(s)
Brown truck driver chic delivered with some head today. I think the exhaust is going to be just fine.....

sutphen 30 03-10-2015 04:36 PM
Originally Posted by brian41 (Post 4276757)
Brown truck driver chic delivered with some head today. I think the exhaust is going to be just fine.....
.what sized did you get?


All times are GMT -5. The time now is 11:32 PM.
Page 4 of 10
« First
2
3
4
5
6
Last »
Show 40 post(s) from this thread on one page


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.