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

[Dave Henry]

"take all of the horror"

That made me laugh.

DaveH


----- 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 2:03 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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