I'm not quite sure on your second question, Hamish would certainly know but
he's probably not on here at the moment.
You may have problems with overspeeding a diesel turbo on a petrol engine
unless it was from a larger capacity engine.
I know the theory behind picking turbos is very technical, and i don't get
on with maths !, i tend to just stick to using something from a similar spec
engine.
I do know that diesel turbos need less cooling than petrol ones as the
exhaust temperature on Diesels is a lot lower.
As a result, most (maybe all) diesel turbos are just cooled by the oil feed
whereas most petrol turbos are water cooled.
If you use a diesel turbo on a petrol engine it may overheat.
Jim
--------------------------------------------------
From: "nigelp" <[email protected]>
Sent: Tuesday, May 31, 2011 4:36 PM
To: "Quantum Owners Group" <[email protected]>
Subject: [Quantum Owners] Turbos
This is a general question not directly Q related. I am investigating
and researching a couple of turbo projects. The first question is
does anyone know if there are any differences bewteen a petrol and
diesel turbo? I presume the wastegate valve will vary, but that would
also be the case between different petrol types, I would assume. One
potential project is a Peugeit 306 1600 engine for my nephew, the
other, which is real pie in the sky, is my Xtreme. Have read Jim's
Zetec turbo article a while ago and need to look at it again.
The second question is; does flow have to be considered in deciding
which turbo? At first I thought that if a diesel was used with lower
engine RPM it would require a lower flow (capacity times engine speed
proportion) however further thinking seems that this wouldn't be the
case as the higher the engine RPM the higher would be the turbine
speed, therefore increasing flow. If anyone can shed any more light
on this woudl appreciate it.
Thanks
Nigel
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