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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   LS Build: In Progress (https://www.offshoreonly.com/forums/general-q/358652-ls-build-progress.html)

mggdoors 04-12-2019 11:08 PM
Originally Posted by mggdoors (Post 4681629)
Verified cam timing. Survey says it is within .5 degrees of centerline. Out she comes. I have decided since I am going to be forced to add split thus adding overlap that I am going to step this **** up a notch. I know it will have to be dry exhaust at this point so screw it. Will give specs within the hour
Survey says 237/252 114+3 or 238/250 111.5+4.5. Both set up on .629 lift. Kicking both around over the weekend

Gimme Fuel 04-15-2019 07:44 AM
Originally Posted by hogie roll (Post 4681770)


They were very high end 750hp LS7 builds. At least 427s, maybe bigger I don’t recall. A skater in Michigan had them.
JIMKID had them. Nice pieces! Saw them in person once.

mggdoors 04-16-2019 05:13 PM
Cams ordered. 237/252 113+3 .637/.621 lift. Should be a fun comparison. Could have went with much more radical setup but this should take the cake while still working well with future modifications

Rookie 04-16-2019 09:52 PM
Originally Posted by mggdoors (Post 4682455)
Cams ordered. 237/252 113+3 .637/.621 lift. Should be a fun comparison. Could have went with much more radical setup but this should take the cake while still working well with future modifications
That's a big swing. Will be great to see the difference.
Thanks

mggdoors 04-16-2019 10:09 PM
Originally Posted by Rookie (Post 4682508)
That's a big swing. Will be great to see the difference.
Thanks
Yep. From one end of the spectrum straight to the other. I was actually going to go with another cam but figured the comparison would be more valid this way, although I did adjust the lsa. Same icl. Same ivo ivc.

mggdoors 04-23-2019 12:28 PM

TracyRR 04-25-2019 08:16 AM
Nice, when is the next dyno date?

mggdoors 04-25-2019 11:10 AM
Talked to dyno guy yesterday and he is saying by the end of next week. Already installed and ready to make noise.

Wildman_grafix 04-26-2019 05:52 AM
Same heads?

mggdoors 04-26-2019 10:42 AM
Originally Posted by Wildman_grafix (Post 4683949)
Same heads?
Same heads.

mggdoors 04-26-2019 12:55 PM

getrdunn 04-26-2019 03:57 PM
Hope all works out well. Make that boy grunt.

TracyRR 04-27-2019 09:47 PM
Inquiring minds want to know.....lol!

mggdoors 04-29-2019 11:36 AM
Originally Posted by TracyRR (Post 4684202)
Inquiring minds want to know.....lol!
That trip was just me dropping it off. Dyno session will be end of this week.

mggdoors 05-01-2019 05:27 PM
Just confirmed. Dyno tomorrow.

sutphen 30 05-01-2019 09:11 PM
Originally Posted by mggdoors (Post 4684780)
Just confirmed. Dyno tomorrow.
hoping for big numbers for you.praying to the hp gods.

Wildman_grafix 05-01-2019 09:29 PM
Post them up when you get them!

mggdoors 05-01-2019 09:56 PM
Will do. Will be a fun test. The cam should be spot on for the application. Valve shrouding should be the only hindering factor at this point. I will be very surprised to not see at least 600. Lets see how greedy this dyno is. Results will tell the tale. Mostly interested in bsfc numbers to tell the truth

mggdoors 05-02-2019 03:38 PM
Valve shrouding 101. Hit my peak dead on the head. Ended up making more power with proform 850 than pro systems 1050. And ran wayyyy better https://cimg0.ibsrv.net/gimg/www.off...c194e0241.jpeg

MILD THUNDER 05-02-2019 04:10 PM
Looks like the new cam didnt give anything up anywhere from 3000 and up

Crude Intentions 05-02-2019 04:11 PM
Who needs torque anyway. Lol What’s the specs again? High compression too right? Looks like it still can’t touch a mild big block. This is good info. Been following along

jsboat 05-02-2019 04:39 PM
Good numbers! Time for me to invest in an LQ4

mggdoors 05-02-2019 05:28 PM
Original cam vs new cam. Both runs with single planehttps://cimg2.ibsrv.net/gimg/www.off...04986f267.jpeg

SB 05-02-2019 05:41 PM
Originally Posted by mggdoors (Post 4684968)
Valve shrouding 101. Hit my peak dead on the head. Ended up making more power with proform 850 than pro systems 1050. And ran wayyyy better
You have data from the run(s) with the Proform ?

mggdoors 05-02-2019 05:48 PM
Originally Posted by SB (Post 4684984)
You have data from the run(s) with the Proform ?
https://cimg8.ibsrv.net/gimg/www.off...94fd7b5b5.jpeg

mike tkach 05-02-2019 05:55 PM
looks like my 550 hp guess was very close.you did loose some weight from the bilge.

mggdoors 05-02-2019 06:14 PM
Originally Posted by mike tkach (Post 4684991)
looks like my 550 hp guess was very close.you did loose some weight from the bilge.
Good guess. I would say that I am pretty much at the limit of stock ls3 heads on a 4.030 bore as far as hp goes, maybe a few more if I wasnt running marine application. Valve shrouding is hurting me so the only thing left to do is porting. I am done playing around with them for the summer and am going boating. At the end of the season, mid november lol, gotta love Arizona, I will be doing cnc heads and roller rockers. Results will be posted again.

mggdoors 05-02-2019 06:21 PM
Originally Posted by Crude Intentions (Post 4684973)
Who needs torque anyway. Lol What’s the specs again? High compression too right? Looks like it still can’t touch a mild big block. This is good info. Been following along
High compression? 11:1 vs stock ls3 10.8. Nope. Mild compression 91 octane gas sippers. Didnt meet my mark. Thats on me. But torque where I need it, not where it breaks drives. Hell I can rev it to 7k safely if I dare lol.

mggdoors 05-02-2019 06:30 PM
run video. Notice the lean spike from 1050 carb. Subscribe for more videos

MILD THUNDER 05-02-2019 06:48 PM
Originally Posted by mggdoors (Post 4684997)

High compression? 11:1 vs stock ls3 10.8. Nope. Mild compression 91 octane gas sippers. Didnt meet my mark. Thats on me. But torque where I need it, not where it breaks drives. Hell I can rev it to 7k safely if I dare lol.
One thing about the stock, car engines, is they have an engine management system. My 6.4L hemi is 10.9:1 stock. It also is very sensitive to octane, air temperature, fuel mixture etc. Could see some short term knock retard just from going from one gas stations 93 to another brand. It runs great, thanks to a modern engine management system that as many failsafes working nonstop to prevent detonation. Basically, they run it on the edge from the factory , and "tuning" doesnt do a whole lot for them. The engines run near peak performance thanks to all those sensors.

That beIng said, prob not where id want to be with a carburetor setup and basic ignition setup. I don't think 11:1 compression is "mild" by any means, for a pump gas boat engine. Id say its a bit closer to borderline , and a bad tank of gas away from knocking itself to death. LS or not, detonation doesnt care what you name the engine. Id keep a close on that tune . What kind of egts were you seeing from cyl to cyl?

mggdoors 05-02-2019 06:53 PM
Originally Posted by MILD THUNDER (Post 4685000)
One thing about the stock, car engines, is they have an engine management system. My 6.4L hemi is 10.9:1 stock. It also is very sensitive to octane, air temperature, fuel mixture etc. Could see some short term knock retard just from going from one gas stations 93 to another brand. It runs great, thanks to a modern engine management system that as many failsafes working nonstop to prevent detonation. Basically, they run it on the edge from the factory , and "tuning" doesnt do a whole lot for them. The engines run near peak performance thanks to all those sensors.

That beIng said, prob not where id want to be with a carburetor setup and basic ignition setup. I don't think 11:1 compression is "mild" by any means, for a pump gas boat engine. Id say its a bit closer to borderline , and a bad tank of gas away from knocking itself to death. LS or not, detonation doesnt care what you name the engine. Id keep a close on that tune . What kind of egts were you seeing from cyl to cyl?
Carb motors can usually take more timing. Already put a safety net in before coming off dyno Max run was 32 backed out to 29. Also implemented a fail safe for water temp to reduce timing in the event of clog or impeller loss.

mggdoors 05-02-2019 06:55 PM
Originally Posted by MILD THUNDER (Post 4685000)
One thing about the stock, car engines, is they have an engine management system. My 6.4L hemi is 10.9:1 stock. It also is very sensitive to octane, air temperature, fuel mixture etc. Could see some short term knock retard just from going from one gas stations 93 to another brand. It runs great, thanks to a modern engine management system that as many failsafes working nonstop to prevent detonation. Basically, they run it on the edge from the factory , and "tuning" doesnt do a whole lot for them. The engines run near peak performance thanks to all those sensors.

That beIng said, prob not where id want to be with a carburetor setup and basic ignition setup. I don't think 11:1 compression is "mild" by any means, for a pump gas boat engine. Id say its a bit closer to borderline , and a bad tank of gas away from knocking itself to death. LS or not, detonation doesnt care what you name the engine. Id keep a close on that tune . What kind of egts were you seeing from cyl to cyl?
https://cimg8.ibsrv.net/gimg/www.off...e38b439ccb.jpg

mike tkach 05-02-2019 06:58 PM
Originally Posted by mggdoors (Post 4684995)

Good guess. I would say that I am pretty much at the limit of stock ls3 heads on a 4.030 bore as far as hp goes, maybe a few more if I wasnt running marine application. Valve shrouding is hurting me so the only thing left to do is porting. I am done playing around with them for the summer and am going boating. At the end of the season, mid november lol, gotta love Arizona, I will be doing cnc heads and roller rockers. Results will be posted again.
just for the hell of it,go to post#4.

mggdoors 05-02-2019 07:01 PM
Originally Posted by mike tkach (Post 4685004)
just for the hell of it,go to post#4.
Lol. Touche

mggdoors 05-03-2019 10:39 AM
Here is a 468 blower motor on the same dyno just for comparison sake. You can decide if it is greedy or not. I believe he said this was 731 cam https://cimg1.ibsrv.net/gimg/www.off...573c66deb.jpeg

hogie roll 05-03-2019 11:07 AM
Maybe they’ll be faster than 525s

SB 05-03-2019 11:17 AM
Originally Posted by mggdoors (Post 4685119)
Here is a 468 blower motor on the same dyno just for comparison sake. You can decide if it is greedy or not. I believe he said this was 731 cam
Show the part of your sheets that shows fuel flow and I will answer this for you.

MILD THUNDER 05-03-2019 11:20 AM
Originally Posted by mggdoors (Post 4685119)
Here is a 468 blower motor on the same dyno just for comparison sake. You can decide if it is greedy or not. I believe he said this was 731 cam https://cimg1.ibsrv.net/gimg/www.off...573c66deb.jpeg
right about what a stock 525sc merc makes with a cam upgrade...

mggdoors 05-03-2019 12:13 PM
Originally Posted by hogie roll (Post 4685124)
Maybe they’ll be faster than 525s
Im sure they will considering I have the ability to rev it if I choose to

mggdoors 05-03-2019 12:18 PM
Originally Posted by SB (Post 4685125)
Show the part of your sheets that shows fuel flow and I will answer this for you.
This is all I have on these. https://cimg3.ibsrv.net/gimg/www.off...0be715f9a2.jpg
https://cimg3.ibsrv.net/gimg/www.off...2ac642fd5f.jpg


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