Join Date: Jul 2003
Location: Unit 2A, Halstead, CO92SZ, UK
Thanked 206 Times in 137 Posts
I had deleted this post.
I now think it should stay
This is bolt on power to an existing engine that for all intents is ablack box item ?
You can bolt on whatever you like to the inlet.
Compared to std, you will lose low to midrange torque so the assumption is top end power ?
The exhaust manifold even now is a work of art.
So lets assume its an 80% efficient engine with conventional frictional & parasitic losses.
How much power your engine will make is purely a product of how much air & fuel it can consume.
So then, assuming the engine is a black box item...you have the following..
1. Increase efficiency but its already efficient so you infer that the original calibration is way too conservative..Bull$hit imho & gains are usually made at the expense of emissions & safety parameters.
So the likelyhood is that you will map fuel & spark even closer to detonation & not have the backdrop of a Knock sensor.
Ok, you could fit a knock sensor.
2.Reduce frictional losses..winded crank counterweights..but still involves a tear up of the engine.
3. Extend the rpm range..!
Is it not the only way to combust more air & fuel ?
Engine contruction, ie the bottom end bolts conrod to crank. Crank bearing load increased...are they a weak point already or not.
The physical restriction of the of the head ,valves / cam timing.
New cams & timing requirement...?
4.The cooling system...Is it efficient ?
Can it be improved easily to cope with power increase in any of the above.
In short, you appear so absorbed in the journey to get more power from an already stretched design concept, that you appeear to have have overlooked the fundemantals of why & for how long.
The how long part is very pertinent as currently, half the active part of this board in Europe are contemplating or actually undertaking rebuilds
One last thing is the dangerous drawing of comparisons of mods made to other engines as a good reason for the same thing to work on another engine.
Same configuration is it.
How efficient was that particular engine to start with ?
My Nissan is tuned...40% increase in power.
Two engine rebuilds in 65,000 kms !
This topic should be more about the straw that broke the Camels back !
Last edited by farrell; 30th August 2006 at 04:37 PM.