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S550 GT350R Race Car Build

Black Boss

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Head rebuilds complete. Block was waiting on Pistons and Rod Bearings that arrived today.

Hopefully it will be back together mid next week.

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Black Boss

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Got a report back from PAC on the broken valve spring. There was a very small inclusion in the wire — took an electron microscope to find it, but at least that means it wasn’t normal spring life:

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TMSBOSS

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There was a very small inclusion in the wire — took an electron microscope to find it,
Wow. The best part of the failure was that it did not drop the valve into the cylinder. You could have had “Inclusions” filling the pan.
 

Jet One

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NIck, do you think you will be able to analyze temp data to show how effective the MMR cooling mod is?

Duane
 

Black Boss

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@Tonymustang302 I believe they are no longer available. Part number is M-19515-M50
@Jet One Duane, I don't anticipate being able to measure any difference. I'm hoping it will lower temps on Cylinders #4 & #8, but any decrease there will likely increase temps on the other cylinders. Next engine teardown and Leak-down testing will tell.

Meanwhile, Got the Headers installed and got the Powertrain back in the car today:

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Black Boss

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How well are you able to get the corner weights equal. No cross but at each front and rear axle?
@steveespo I didn't pay much attention, as I just wanted to get it right pre dyno and I'll fine tune with ballast, now I have the Dyno results. Last season front left was 87lb higher than right and rear left was 102lb higher than right at 50% Cross weight.

Car dyno'd up 3 rwhp peak and average rwhp after rebuild so I have to add an additional 24lb of ballast. The (much) better news is torque was WAY up (anywhere from 8-26 ft-lbs from 3,000-6,400rpm)
 

steveespo

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@steveespo I didn't pay much attention, as I just wanted to get it right pre dyno and I'll fine tune with ballast, now I have the Dyno results. Last season front left was 87lb higher than right and rear left was 102lb higher than right at 50% Cross weight.

Car dyno'd up 3 rwhp peak and average rwhp after rebuild so I have to add an additional 24lb of ballast. The (much) better news is torque was WAY up (anywhere from 8-26 ft-lbs from 3,000-6,400rpm)
Thanks Nick, Those numbers are similar to what Ernie and I saw. He thought we could get left/right closer to equal but with my ballast on the left side no way.
Steve
 

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