Paul (Notts)
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| posted on 4/5/06 at 07:56 PM |
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RV8 cam shaft
Just about to place an order with RPI for a webber 500 kit and a new cam shaft. They have a choice of the following cams in their kits..
Piper 270/110
Piper 270/2
Piper 285
RP4, Optimax cam
Any one with a RV8 got any veiws on which one to opt for or other comments..
Was thinking about the 270/110
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Simon
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| posted on 4/5/06 at 08:23 PM |
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I'm sticking fuel injection and a couple of turbos on mine
You best bet would be to talk to them - let them know what it's going in and your expected useage (realistic - not trackdays everyday) and
I'm sure they'll suggest most appropriate bits.
HTH
ATB
Simon
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wilkingj
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| posted on 4/5/06 at 08:23 PM |
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I got a Viper Hurricane from www.V8tuner.co.uk
Not so much extra BHP but more a case of no additional machining to be done to the head on the valve spring seats. Viper Typhoon was more power but
head work for the springs.
I went for a combination of power and economy.
Dont forget... New Cam = NEW LIFTERS as well.
Or you will trash your nice new cam.
I fitted Rhoads Lifters which are a bit leaky (on purpose) ie they dont open fully at very low revs this helps with low down torque and economy. They
then open up fully when the revs get up a bit. Only downside is they are a tiny bit noisier at tickover. No real problem there.
Having driven mine for a few miles to the Mot... Its bloody quick, so you dont need to do loads to the engine to make it go well. A std 3.5 RV8 will
go like the clappers anyway
I have RV8 3.5L, webber 500 and hurricane cam. std LT77 box, 3.62 Diff, and 17" wheels... 1st gear is almost a waste of time... all wheel spin
and revs!
So dont go too mad.. It will go well.
Check your Engine has a slant backwards, so the oil drains correctly in the engine and heads.
You may also need a 5 degree spacing plate to level up the carb, I have not done this yet.
see the notes at http://www.v8tuner.co.uk
Also look into a Phenolic Carb Spacer as well to help stop the dreaded poor starting when the engine is hot.
Insulate all fuel pipes near the engine and keep them away for heat sources. to stop fuel evaporation and air locks in the fuel pipe.
Cobra Club info
You can see I have been reading up on it!
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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mark chandler
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| posted on 4/5/06 at 10:15 PM |
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Its a good idea to drill a couple of holes through the block into the top of the cam valley to lubricate the cam chain and drain oil forwards.
I have tried various cams in the past, to be honest all you really need is a 3.9 efi cam, you can get cam kits for these for around £100, look in
Landrover magazines etc.
RPI have a good reputation but are expensive... Why muck about with a Weber, second hand EFI is not expensive, the looms are completely seperate from
the cars so all you need is switched live, perment live and an earth to run this.
Regards Mark
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Agriv8
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| posted on 5/5/06 at 07:10 AM |
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I am running 3.5 bolted up to 3.9 hotwire efi and westie plenum.
Cam is a Viper Typhoon you can get a special set of springs so no machining required to head ( got details at home ) can recomend real steel as well
who are also freindly and cheeper than RPI.
Running Rhodes lifters.
Another one to make sure you do on the rebuild is set the pre-load on the lifters by shimming the rocker posts corectly.
I have no nead for 1 gear either.
Future upgrades after macket ecu and spark so I went for EFI. Will be upgrading my block next winter I hope.
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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