depressing #'s dyno and track....
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
+1 for checking pushrod lengths. i used to have a torquer 3 (similar cam only with lower duration) and something was screwy with the pushrods but a local specialist squared it away for me. i picked up a very good amount of power afterwards. do you have any weird ticking noises coming from the engine bay?
Do you know what you set the preload on your lifters to? To me it looks like your pushrods are not long enough, usually you see a longer pushrod on a setup like that. If the preload is incorrect on the lifters you can definately leave power and performance on the table.
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
.080-.120 is lifter preload on LS7 lifters i beleive.
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
i went with the texas speed combo,. this is the same setup they used. the MS4 loves compression.
As Pat G mentioned you pushrods may be too short. The MS4 has an LSK lobe for the intake doesnt it? My setup required 7.450 pushrods with .080 preload on lsk lobes. I know you have milled heads but i doubt they were milled THAT much. I cant imagine you are getting 250psi compression either with that cam I'm only seeing in the 160s with mine. Maybe you are seeing that high of compression because your valves are staying closed longer from your short pushrods?
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To get to 58cc the heads would have been milled ~.025. FWIW with the specs you posted, your compression is 11.25:1 assuming .010 out of the hole. If they ran your piston at zero deck, its closer to 11.0:1.
7.350" should be near perfect for your engine, as it was for mine. I'm running the exact same setup, same heads milled to 59cc, .040" gasket, and MS4 cam. With the LS1 lifters the 7.350" pushrods were too short, and with the LS7 lifters were dead on.
245psi seems awfully high, almost impossibly high. All mine were right around 190-200 psi on a tight shortblock.
245psi seems awfully high, almost impossibly high. All mine were right around 190-200 psi on a tight shortblock.
On The Tree
Joined: Jul 2006
Posts: 143
Likes: 0
From: great white northeast
7.350" should be near perfect for your engine, as it was for mine. I'm running the exact same setup, same heads milled to 59cc, .040" gasket, and MS4 cam. With the LS1 lifters the 7.350" pushrods were too short, and with the LS7 lifters were dead on.
245psi seems awfully high, almost impossibly high. All mine were right around 190-200 psi on a tight shortblock.
245psi seems awfully high, almost impossibly high. All mine were right around 190-200 psi on a tight shortblock.
His compression guage is most likely not accurate. No 2 ever read the same anyway.
Original poster: What do your plugs look like? Can you post some good pics, show what they look like with threads and take a few with them cut off. I dont give a **** what the dyno A/F shows. See what your plugs shows. I have to wonder if you may have a consistant voltage drop and are getting low spark. Your tune alone is not giving up that much power WOT.
I would think the gauge is reading high. You dont just get more compression than around 200 psi. If the engine is at TDC and valves are sealed well, thats around what you get.
Original poster: What do your plugs look like? Can you post some good pics, show what they look like with threads and take a few with them cut off. I dont give a **** what the dyno A/F shows. See what your plugs shows. I have to wonder if you may have a consistant voltage drop and are getting low spark. Your tune alone is not giving up that much power WOT.
Original poster: What do your plugs look like? Can you post some good pics, show what they look like with threads and take a few with them cut off. I dont give a **** what the dyno A/F shows. See what your plugs shows. I have to wonder if you may have a consistant voltage drop and are getting low spark. Your tune alone is not giving up that much power WOT.
245 psi is very high for cranking compression. In my opinion it is too high for 93 octane. Your tuner was probably limited in the amount of timing he was able to run. Put VP 109 in it and re-dyno, it should make a huge difference.
Staging Lane
Joined: Mar 2006
Posts: 56
Likes: 0
This may help (you feel better anyway) as I have a similar setup and made only 405rwhp with a manual. I have 61cc Patriot LS6 heads and 11.5:1 comp ratio, MS4, Vic Jr intake, headers, internals, stock rockers and Caddy racing lifters. Its not the first time I've heard of this hp with this cam and setup.