Build v2.0
07-18-2014, 02:46 PM
#1
Safety Car
Thread Starter
Build v2.0
[link to original build - http://forums.corvetteforum.com/c6-f...hp-815wtq.html]
Earlier this season I was making some test hits on the car and noticed a drop in oil pressure. It dropped off in a big chunk at first, but was still making 'driveable' pressure. Then it slowly started dropping further and further till it got down around 12psi hot idle and would sit at 0psi on start up till it built some pressure. I changed the oil, cut the filter, didn't see any metal, but something was wrong for the oil pressure to keep getting worse and worse.
I'd turned the boost up this year and was making close to 1,000whp on a stock crank and Eagle H-beam rods, so I decided that I would investigate and possibly upgrade at the same time.
Everything coming apart:
Root cause: broken Melling oil pump pressure spring. I'd never ever heard of one of these breaking, and while I'd thought about possible pump/bypass problems, the symptoms didn't seem right w/ the pressure fluctuating. $5 part started thousands and thousands of dollars of rebuild/upgrades.
Bearings looked ok, little wear from the lack of oil pressure:
I decided to rebuild the motor while it was out using a new Lunati Signture Series crankshaft and Callies Ultra-H rods. I reused the same Wiseco pistons and kept compression ~10:1. I also reused the lightly ported LSA heads, but upgraded to a CCP Stg. 3 'Jam' cam. I swapped to a 10-rib belt setup using an ATI 8.190" balancer and the blower pulley will be a 3.85" from Dallas Performance. Just got word from Siebert Performance here in KS that the motor is all done:
While everything has been apart I've been talking to the guys across town at ProCharger about some possible upgrades to make use of this new motor. I picked up one of their first race series intercoolers that should handle all the boost the new blower is going to make (more on that to come later
)
My old motor held up great and other than the oil pump spring it looks like it could have kept on going at the ~950whp level for a while longer. With this new setup though I'm hoping for ~25psi and ~1,100whp.
Earlier this season I was making some test hits on the car and noticed a drop in oil pressure. It dropped off in a big chunk at first, but was still making 'driveable' pressure. Then it slowly started dropping further and further till it got down around 12psi hot idle and would sit at 0psi on start up till it built some pressure. I changed the oil, cut the filter, didn't see any metal, but something was wrong for the oil pressure to keep getting worse and worse.
I'd turned the boost up this year and was making close to 1,000whp on a stock crank and Eagle H-beam rods, so I decided that I would investigate and possibly upgrade at the same time.
Everything coming apart:
Root cause: broken Melling oil pump pressure spring. I'd never ever heard of one of these breaking, and while I'd thought about possible pump/bypass problems, the symptoms didn't seem right w/ the pressure fluctuating. $5 part started thousands and thousands of dollars of rebuild/upgrades.
Bearings looked ok, little wear from the lack of oil pressure:
I decided to rebuild the motor while it was out using a new Lunati Signture Series crankshaft and Callies Ultra-H rods. I reused the same Wiseco pistons and kept compression ~10:1. I also reused the lightly ported LSA heads, but upgraded to a CCP Stg. 3 'Jam' cam. I swapped to a 10-rib belt setup using an ATI 8.190" balancer and the blower pulley will be a 3.85" from Dallas Performance. Just got word from Siebert Performance here in KS that the motor is all done:
While everything has been apart I've been talking to the guys across town at ProCharger about some possible upgrades to make use of this new motor. I picked up one of their first race series intercoolers that should handle all the boost the new blower is going to make (more on that to come later
)My old motor held up great and other than the oil pump spring it looks like it could have kept on going at the ~950whp level for a while longer. With this new setup though I'm hoping for ~25psi and ~1,100whp.
Last edited by turbotuner20v; 07-19-2014 at 09:16 AM.
07-18-2014, 03:08 PM
#3
Safety Car
Excited to see the outcome of this. One omission I noticed was the blower. Sticking F1A or went X?
07-18-2014, 03:16 PM
#4
Safety Car
Thread Starter
07-19-2014, 02:29 AM
#7
Drifting
Freaking BYPASS spring!!! WOW. Another reason to hate Melling oil pumps! There springs are a lot longer and the factory ones. Those bearing look good really just wore thru the coating, so I agree you could have kept going at those power levels for a lot longer probably. Everything looks awesome Jeff keep us posted on the rest of your build!
07-19-2014, 09:10 AM
#11
Safety Car
Thread Starter
Freaking BYPASS spring!!! WOW. Another reason to hate Melling oil pumps! There springs are a lot longer and the factory ones. Those bearing look good really just wore thru the coating, so I agree you could have kept going at those power levels for a lot longer probably. Everything looks awesome Jeff keep us posted on the rest of your build!
I went with that Centerforce dyad DFX clutch this time around
07-19-2014, 01:11 PM
#16
Safety Car
07-19-2014, 06:53 PM
#17
Great build. Very similar to my motor but with much more blower.
07-21-2014, 11:49 AM
#20
Safety Car
Thread Starter
picked the motor up from the builder on sunday... it's back home on the stand, should drop it in soon.
It seems like I'm on a streak for breaking parts that shouldn't break though....
First that melling oil pump spring, then when the heads were going on, one of the ARP studs snapped. Thankfully the break was so jagged it just unscrewed with some downward pressure.
Anyone ever broken one of these before?
It seems like I'm on a streak for breaking parts that shouldn't break though....
First that melling oil pump spring, then when the heads were going on, one of the ARP studs snapped. Thankfully the break was so jagged it just unscrewed with some downward pressure.
Anyone ever broken one of these before?