[Supras] Mystery Knock? (related to high rpm shifting?)

[Rockey Fox]

Stuck with OEM pistons and rods as they measured within tolerance per the machine shop who did the bottom end. I'm sure that I'll eventually need to "finish" the first rebuild :) after I ignore it to the point of becoming genuinely concerned. I'm sure it's better overall to wait until the engine warms up to be boosting anyway, now I have a reminder.

----- Original Message ----
From: Jeff Mohler <speedtoys.racing at gmail.com>
To: Rockey Fox <supr91tt at yahoo.com>
Cc: supras at supras.com
Sent: Monday, April 16, 2007 3:03:51 PM
Subject: Re: [Supras] Mystery Knock? (related to high rpm shifting?)

You "rebuilt" the motor, including paying for high-rpm balancing, but didnt rebuild the parts that take all of the horror of high RPMs?

Clearly something has more clearance cold than it should..so..ignore it, or "rebuild" it again, but this time finish the first rebuild.




On 4/16/07, Rockey Fox <supr91tt at yahoo.com> wrote:
I frequently shift at 6500 rpms and did pay for the rotating assembly to be balanced during the rebuild. After a year now I do detect a slight knocking when I boost (even 2psi) before the engine reaches operating temp. There is absolutely no detectable knock under any circumstances after operating temperature is reached.

I did recently upgrade the compressor to 57 trim on the CT-26 and I limit boost to 11psi on the stock ECU and injectors, FIPK and 3" exhaust from turbo via a defcon downpipe and crinkle bent (already on the car when I bought it) exhaust.

I'm leaning toward wrist pin more than rod bearing noise but I won't really know until it breaks. Any other ideas? I didn't bore or replace pistons during the rebuild.

Rockey 91T





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