1gDSM4g63
15+ Year Contributor
- 1,808
- 14
- Aug 28, 2007
-
San Jose,
California
Yeah, if you're only going to use the car for drag purposes and you're looking for top-end power in the 9000rpm+ I would consider aluminum rods.
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I have eagle 88MM crankshaft
For the turbo,That advises to me you for over 800hp
i think for one forced performance or divided T72
My futur exhaust manifold Divided T4 Manifold - Gen 2 from shearer fabrications
Aluminum rods don't have a very long life and best if you don't use as a daily driver
Kevin, would you have any comments on oil pressure at the higher rpms as well concerning the stock cylinder head oil galley hydraulic lash adjuster pressure regulator? I have reviewed the information on your site in the past and the part you have made to help with the oil pressure levels at high rpms along with your datalogs. Could you please add some detail to the conversation regarding your piece you made, since I believe that there are many people that have not seen the part, and it could play a beneficial role in their setups.
Sorry, I'm a little slow on the uptake here.
In OEM trim the lifters receive high oil pressure that is simply plumbed to them from the engine oil pressure chain through a little block that bolts to the head with 3 M6 fasteners. This can put pressure to the lifters possibly as high as 100psi, spraying gobs and gobs of oil on the rockers and cam lobes. The amount of oil this moves is way more than is really needed. All this oil needs to find its way back through the head drainbacks to the pan. Lowering oil pressure to the lifters also lowers this oil flow and does a better job of keeping the pan full of oil during high rpm operation.
Lifters also are happier with lower oil pressure supply. They seem to pump up less if the valvetrain loses control. I don't have a good technical reason for this (their chamber isn't directly exposed to oil pressure), but it seems to be how they work. My part also adds an air bleed at the highest part of the system to minimize air pockets to the lifters. Obviously, lifters don't like air instead of oil.
My part regulates the lifter supply down to 15psi by a flow-restricting pressure regulator. This is plenty of pressure and flow to keep the valvetrain lubed. There was a JDM regulator randomly in very early DSM's and some imported motors that regulated the lifter pressure by dumping extra flow out to the head. It ran similar pressure to mine, but didn't help the oil return and oil stackup in the head situation. Those units are also quite rare.
Thanks,
Kevin
. But it looks like your legit from the car. If you plan on spinning the motor above 8500 I would invest in a good set of aluminum rods with weisco or Ross pistons 280 cams and either ETS or SBR race fmic for IC setup. A good set of 3g lifters and ffwd/kiggley behive springs and retainers are ideal for reving that high with aggressive cams but you ca get away with something like manley or crower.Hi,
have you a example of owner with a aluminium rod for little street and drag racing????
thanks
... but from what my Machinist tells me, when he's tried to cut a cryotreated crank, its alot harder surface/process than cutting a non cryo treated crank...