|
With milodon pan i cannot use the gm original main bolts, so i bought arp 135-5201 main bolts and found out that the arp bolts are 0.150" shorter compared to gm bolts, I quess this is not a problem? Arp only lists this kit for gen IV/gen V.
|
Originally Posted by JaniH
(Post 4898182)
Heads are ready. ferrea 6000, int 30dg backcuts, new seats, bowl/short turn blend, good port had too high air speed @.600 and up, trimming the head bolt pump fixed the problem. 1=good port, 2=bad port, 3=exhaust no pipe, 4.5" bore adapter.
https://cimg2.ibsrv.net/gimg/www.off...85a78e85e8.png |
Originally Posted by Tartilla
(Post 4899059)
The 0.400" loft is pretty good. Exhaust doesn't choke off at higher lift/flow. They should make some good power. What seats did you end up using?
|
Originally Posted by JaniH
(Post 4899060)
Have to to ask about the seat angles. Quess that the 650-675hp might be possible. Now i try to decide what icl i instal the cam.
|
Originally Posted by Tartilla
(Post 4899063)
My bad...was looking to see what metal style of seats you used. Powdered metal?
|
Starting to steer away from these arp bolts. How many threads should be engaged in the block? I know the old rule for depth is the thicknes of the bolt, but i am barely there with these.
https://cimg2.ibsrv.net/gimg/www.off...1bd359803b.jpg |
Originally Posted by JaniH
(Post 4899263)
Starting to steer away from these arp bolts. How many threads should be engaged in the block? I know the old rule for depth is the thicknes of the bolt, but i am barely there with these.
https://cimg2.ibsrv.net/gimg/www.off...1bd359803b.jpg Conventional wisdom holds that 1-1/2 X thread diameter will achieve maximum thread strength. Personally, I like as much as I can get, and have designed parts with 2-1/2 to 3 X thread diameter, just to make myself feel better about them. I haven't the foggiest on head bolts, but I'd think you'd want considerably more thread engagement than single thread diameter. Thanks. Brad. |
Put studs in.
|
Originally Posted by Sporl Performance
(Post 4899284)
Put studs in.
|
Originally Posted by JaniH
(Post 4899297)
Do i need to line hone the mains then?
|
|
Intake almost ready and will be test fitted the last time during the next week. Got a nice set of johnsson 2126bbr lifters from Sporl performance, and currently checking the valvetrain geometry. I went with the shortest valves that was possible with the my 290cc floteks, 5.35" exh/ 5.32" int, and got perfect 040" sweep right in the center of the valve tip with 1.7 crane gold rockers. Isky 9005 spirngs 185/470lbs. Damn those 2.3" ferrea intake valves are heavy, 155g so going to use titanium retainers at intake side to get the weight closer to the exhaus valve, wich is 135g.
https://cimg3.ibsrv.net/gimg/www.off...fc04edb345.jpg https://cimg8.ibsrv.net/gimg/www.off...03f8d04bd7.jpg https://cimg9.ibsrv.net/gimg/www.off...5526efd234.jpg |
No cam sync? Just crank trigger?
Can you run sequential with just crank trigger? |
Originally Posted by Rookie
(Post 4904272)
No cam sync? Just crank trigger?
Can you run sequential with just crank trigger? |
Originally Posted by JaniH
(Post 4904280)
Only 36-1 crank trigger, sequential fuel / wasted spark ignition. Sequential ignition needs cam trigger. At first i was thinking to use the tb distributor as cam trigger, and run sequential ign, but i dont know if need the sequential ignition that much.
|
Made solid dummy lifter from a old sbc hyd lifter, i can adjust the seat height with washers.
https://cimg0.ibsrv.net/gimg/www.off...0f49606aae.jpg |
Some progress for a long time. Plenum to intake alignemet was horrible wich is now corrected.
Going to give final touch for the plenum port entrys tomorrow and intake is ready. Also timed the cam and set the icl to 108. The cam is 240/245 @050, 301/306 @006", 114lsa, 0.665/0.665 lift. I may advance the cam 2 degrees more 106icl before the first dyno pull, and then set the icl to 110 and see how it effects the powerband. https://cimg6.ibsrv.net/gimg/www.off...7849d0f499.jpg https://cimg4.ibsrv.net/gimg/www.off...0d30706907.jpg https://cimg5.ibsrv.net/gimg/www.off...0a30326955.jpg https://cimg7.ibsrv.net/gimg/www.off...1a909e9adc.jpg https://cimg9.ibsrv.net/gimg/www.off...8d91940e0f.jpg https://cimg5.ibsrv.net/gimg/www.off...18bf81beb.jpeg https://cimg8.ibsrv.net/gimg/www.off...16bf03292.jpeg added alignemet pins for plenum before port matching https://cimg5.ibsrv.net/gimg/www.off...2d9df49e00.jpg |
Originally Posted by Rookie
(Post 4904272)
No cam sync? Just crank trigger?
Can you run sequential with just crank trigger? |
You can batch fire it and never know the difference unless there is a problem with air distribution where you would need to tune each cylinder.
|
Originally Posted by snapmorgan
(Post 4906396)
You can batch fire it and never know the difference unless there is a problem with air distribution where you would need to tune each cylinder.
|
This project seems to be never ending battle. The oil pan kickout is so wide that there is no chance to make the merc raw water pump to fit. I knew i need some kind of mine starter motor, but i tought the pump would fitt. Wonder how the johnsson F6B-9 crank mount pump would work?
https://cimg8.ibsrv.net/gimg/www.off...c58ae36e71.jpg |
make a bracket to kick it out what you need.
|
Engine is running, 2 weeks to dyno test. First pulls with big tube headers and 10 lambda, then with wet stainless marine manifolds. Are you guys using Sealant with the sm riser gaskets? What sparkplugs i should use? I have ngk bkr6e now installed.
|
Shouldn't have to seal the gaskets as long as the surface is in good shape.
|
Engine made 665hp @6000rpm, 854nm @5100rpm. Will post the dyno sheet later.
|
623lbs of tq,,very nice,,is that a jones cam?
|
Originally Posted by sutphen 30
(Post 4920760)
623lbs of tq,,very nice,,is that a jones cam?
|
Sae j1349 corrected power. 32dg timing. There is still vacum at max rpm, maybe the flame arrestors are restricting the air flow. 2 1000cfm throttle bodies wide open :D
https://cimg9.ibsrv.net/gimg/www.off...05b2b9d24f.jpg |
bump that timing to 34°
|
Originally Posted by JaniH
(Post 4920767)
Sae j1349 corrected power. 32dg timing. There is still vacum at max rpm, maybe the flame arrestors are restricting the air flow. 2 1000cfm throttle bodies wide open :D
https://cimg9.ibsrv.net/gimg/www.off...05b2b9d24f.jpg For my education, you would prop this boat to run WOT at a 56-5700 RPM, correct? Thanks. Brad. |
Originally Posted by Brad Christy
(Post 4920821)
Guys,
For my education, you would prop this boat to run WOT at a 56-5700 RPM, correct? Thanks. Brad. https://cimg8.ibsrv.net/gimg/www.off...bef36ae83c.jpg . |
Very respectable numbers. I saw in earlier posts you were looking to have 6000rpm rev limiter?
Expect to prop max rpm around 5800 ish? Did you manage to test beyond 6k rpm to see where the power curve turns down? Generally, longer exh duration maintains peak power curve and flattens it out. Good for marine looking to prop to that broad curve. The Flotex 290s really worked out for you. Pardon if ypu mentioned it...but was the dyno sheet with the Stainless Marine exh manifolds on? Did you have any BSFC #s to speak to your i take manifold mod benefits etc? Thanks for sharing the build and results. |
Originally Posted by Tartilla
(Post 4920956)
Very respectable numbers. I saw in earlier posts you were looking to have 6000rpm rev limiter?
Expect to prop max rpm around 5800 ish? Did you manage to test beyond 6k rpm to see where the power curve turns down? Generally, longer exh duration maintains peak power curve and flattens it out. Good for marine looking to prop to that broad curve. The Flotex 290s really worked out for you. Pardon if ypu mentioned it...but was the dyno sheet with the Stainless Marine exh manifolds on? Did you have any BSFC #s to speak to your i take manifold mod benefits etc? Thanks for sharing the build and results. |
What you guys think about my timing curve? This is the one we used in the best dyno pull. We did not test anything else. Just increased the max from 28dg to 32dg in 2dg steps. From 30 to 32 made 18hp more.
https://cimg1.ibsrv.net/gimg/www.off...30e58ce6c.jpeg |
What software or website are you using to compare cams? (i'm newbie can't quote post)
|
nice work doing a carb tunnel ram intake to efi.
|
Originally Posted by madmax2
(Post 4930761)
What software or website are you using to compare cams? (i'm newbie can't quote post)
|
First testdrive done. Carefullly keeping eye for oil pressure, coolant temp, afr readings, etc. Engine felt powerfull but was way too rich, 10,7 all over the powerband below 5000rpm. Next day we started cutting some fuel, setting it to a 12,4 afr. Felt some missfiring or something now and then so i tought to remove the spark plugs and check what is going on, found that the cyl 6 spark plug thread was black all the way, not sure if it felt loose when removing it but there is nothing else that comes to my mind that could cause this, also there was half point difference in afr readings between cylinder bank 1 and 2. The plugs are ngk bkr6e.
https://cimg9.ibsrv.net/gimg/www.off...a6ca5b503.jpeg |
Heat range #6 is hot, why are you running those ?.........did the washer get crushed
|
Originally Posted by F-2 Speedy
(Post 4930907)
Heat range #6 is hot, why are you running those ?.........did the washer get crushed
https://cimg2.ibsrv.net/gimg/www.off...a62c2e0a2.jpeg |
| All times are GMT -5. The time now is 09:34 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.