GrumpyOne
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| posted on 13/8/09 at 09:24 AM |
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Engine & Gearbox 2
Morning Peeps
Does anyone have any experiance of the early (1999) Jaguar 3.0ltr V6 engine as used in the S Type?
Is it reliable, what problems would I encounter using it in a Viento? What would I need to do to make the VVT work?
I am planning on using a Megasquirt, would I need the Jag ECU instead?
Any help appreciated
Thanks
Colin
My wife is very understanding, she understands that if I am in the garage I am not in the house annoying her.
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speedyxjs
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| posted on 13/8/09 at 09:35 AM |
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Iv never heard of any problems with that engine. Seems to be just as reliable as the V8's.
How long can i resist the temptation to drop a V8 in?
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Guinness
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| posted on 13/8/09 at 09:35 AM |
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I'll be watching this thread with interest as that is my current engine / gearbox choice for replacing the Kwak in my Indy.
AFAIK Megasquirt can control the VVT, but only on / off rather than continously variable.
Mike
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GrumpyOne
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| posted on 14/8/09 at 08:11 AM |
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quote:
Originally posted by Guinness
AFAIK Megasquirt can control the VVT, but only on / off rather than continously variable.
Mike
Knowing nothing about VVT, how would that work and how would it effect the engine?
Colin
My wife is very understanding, she understands that if I am in the garage I am not in the house annoying her.
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Guinness
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| posted on 14/8/09 at 08:38 AM |
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I'm by no means an expert, just starting to look into it.
As I understand it, the variable valve timing is controlled by the ECU, via a pressurised oil circuit, which varies the cam timing dependant on lots
of parameters, revs, emissions, temperature, grade of fuel etc.
Obviously this is beyond the capability of most aftermarket ECU's.
However, we usually forgo such things as economy, emissions etc for raw power..
So, some aftermarket ECU's have a switched output that is programmable. So you connect the switch to the soleniod that flips the cam timing,
from mild to wild, and set the parameters to only open above say 3,000 rpm and on half throttle or more.
Dave Walker at Emerald has done some work with the VVT system on the K-series.
Coozer has the VVT Focus engine in his MNR and is running the valve timing through the megasquirt.
Mike
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GrumpyOne
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| posted on 14/8/09 at 09:52 AM |
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You are more of an expert than me that's for sure 
I think I understand it a bit better now and from your post am am taking that although the engine might have VVT it is not necessary to make it run
alright and I can use the Megasquirt to turn it on and off.
I didn't want to rush out and buy the engine if I couldn't make it work and the VVT was worrying me
Many thanks
Colin
My wife is very understanding, she understands that if I am in the garage I am not in the house annoying her.
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Willie
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| posted on 17/8/09 at 11:23 PM |
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Its only the Jag engine that has VVT. The same engine in other applications (ST220) doesn't.
Some other applications have roller finger followers though, wereas the Jag has the, better, "Direct Acting Mechanical Bucket", which is a
fancy way of saying "solid tappet". They do have shims on top however, so if you're for fitting mega mad cams, its advisable to fit
shim under tappets, incase the thin shim on top breaks up.
I think the cams are all interchangeable, but don't know this for fact. I think the intake cams on the Jag are two piece, so its possible these
could be replaced with solid cams from a 2.5, or 3.0 to get around the VVT issue...but you won't get the full 240bhp then. Catcams and Piper
both do hot shafts for the Jag.
Willie
Willie
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