<VV> Re: Turbo Boost

[Bill Elliott]

Sorry Lon... I should have also noted that I am running a set of your KB 
HK's in my very similar "hot" turbo 140 engine with absolutely no 
problems. I would not even consider a set of Fed Mogul forged for a hot 
turbo application... they might be better than stock, but not nearly as 
good as the KB's. IMO, of course. My only (intended) comparison were 
between the KB's and the custom forged... I think there is no comparison 
the other way.

IMO, you are correct that most customers really don't need anything more 
than the KBs, but they DO need more than the "standard" forged to run 
high boost.  I should have more carefully spelled this out in my response.

But I am also very careful concerning detonation... my recommendation to 
go with custom forged was only to give a slightly higher margin of error 
with regards to potential detonation damage. The engine builder would 
need to consider whether this was worth the additional cost.. I think 
it's likely that most would think it's not.

Bill


corvairs wrote:

> Bill - Have to dissagree. When the pistons are set up as the 
> manufacturer recommends (something some folks make a cottage industry 
> of ignoring) the KB's are good for a great deal more than you stated.  
> "Ray's pistons" are Aires forged, which I have no doubt are better 
> than my Keith Blacks - at more than twice the cost. They can be 
> ordered directly from Aires for about the same price, but if Ray has 
> had some made and is keeping them "on the shelf" for immediate 
> availability then buy them from him as reward for doing that.
>
> Why do I suspect that the Aires forged are better than my KB's? Just a 
> logical assumption, knowing how they are made and what they are - The 
> same way that I suspect that my KB's are better than Fed Mogul forged. 
> Do most customers need to spend the extra money for the Airies? I 
> wouldn't think so, as our KB's are being used successfully in a number 
> of VERY high stress applications. With the forged and the KB's being 
> pretty close to the same price the KB's make the most sense. A third 
> run of the KB's is expected  this Spring. Lon
>
> www.corvairunderground.com
>
> Bill Elliott wrote:
>
>> You have two main problems to deal with...  detonation and pistons.
>>
>> However, 15psi is the point at which the TRW pistons collapse. You 
>> can go to around 20psi with the KB HK pistons, but these are very 
>> brittle and VERY prone to detonation damage, so you have to be VERY 
>> careful when using them. Best way to go (with a little more room for 
>> error) are the custom forged pistons from Ray.
>>
>>
>
>


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.15/223 - Release Date: 1/6/2006