New to the forum here, but always referenced it’s material. Little background info, I have a built and stripped down ‘04. Been running an ancient hp performance twin 50mm turbo through a built mvb 4r70. I’ve raced this car off and on for 10 years, and just two years ago I’ve decided to take it off the street completely.
Figured I would run a cold compression test at the end of the season. I figured if it was getting tired, I’d go ahead and do some upgrades. Engine was originally built in 2008. Kellog crank, Manley rods, -18cc diamond pistons, ported pi heads. Since then I’ve put on trick flow 38cc to bump compression, and a secret sauce set of bump sticks. I’ve only had 15psi through it, and it has been dead reliable for 6 race seasons.
Originally I had 190psi cold, within 10% all cylinders. Now I have 170psi average, with cylinder 4 at 125 psi and cylinder 8 at 135psi. I believe that’s all I need to convince me.
I hope to be able to keep crank, rods, heads and cams. I may change pistons for higher comp (I’m running 114 octane) if they don’t mic round anymore. Also, I’m tossing the block to go to the aluminum block for weight savings.
Since I’ve been out of the engine building game for this long, what is some current advice/tips/tricks? This engine was built when the terminator was the best out there, and cams were all re-grinds. I know the game has changed and the aftermarket has a solution for every problem. The same suggestions would be welcome for bearings, rings, gasket brands, etc. there are some upgrades I’d like to do such as mmr’s billet timing guides and maybe adjustable cam gears, but a lot of others that I probably don’t need. And as much as I respect other engines, It will stay twin turbo 2v 4.6!
Figured I would run a cold compression test at the end of the season. I figured if it was getting tired, I’d go ahead and do some upgrades. Engine was originally built in 2008. Kellog crank, Manley rods, -18cc diamond pistons, ported pi heads. Since then I’ve put on trick flow 38cc to bump compression, and a secret sauce set of bump sticks. I’ve only had 15psi through it, and it has been dead reliable for 6 race seasons.
Originally I had 190psi cold, within 10% all cylinders. Now I have 170psi average, with cylinder 4 at 125 psi and cylinder 8 at 135psi. I believe that’s all I need to convince me.
I hope to be able to keep crank, rods, heads and cams. I may change pistons for higher comp (I’m running 114 octane) if they don’t mic round anymore. Also, I’m tossing the block to go to the aluminum block for weight savings.
Since I’ve been out of the engine building game for this long, what is some current advice/tips/tricks? This engine was built when the terminator was the best out there, and cams were all re-grinds. I know the game has changed and the aftermarket has a solution for every problem. The same suggestions would be welcome for bearings, rings, gasket brands, etc. there are some upgrades I’d like to do such as mmr’s billet timing guides and maybe adjustable cam gears, but a lot of others that I probably don’t need. And as much as I respect other engines, It will stay twin turbo 2v 4.6!