If the recent 4.2s and 4.5s are relatively similar
Discussion
the main reason will be the different inlet designs .. on the 4.2 you get the fabulous cast alloy inlets with proper injector - under - butterfly arrangement.
On the 4.5 you get those funny purple things with the injector firing onto the back of the butterfly .. yuk. Supposedly good for power, but as we all know the 4.5 cerbie just doesn't deliver on that score in std form.
hope that helps.
On the 4.5 you get those funny purple things with the injector firing onto the back of the butterfly .. yuk. Supposedly good for power, but as we all know the 4.5 cerbie just doesn't deliver on that score in std form.
hope that helps.
rjben said:
So what does a 4.5 cerby deliver in standard form? Exactly what can be done to mod the engine?
Cheers,
Rob
Remove 4.5 engine, place 4.2 engine in bay
Ok I'll get my coat
I'm still thinking about those inlet mods, I know it is only a little bit of power but all the little bits add up..
D.
From what I've been told and understand, it appears that the main difference is the inlet manifolds of the 4.5 are one of the main contributing factors to the higher power output. I suppose if you could devise some less restrictive inlet manifolds for the 4.2 such as using 4.5 manifolds it might help. But as per the previous note this would probably effect the fueling and injector usage.
Although this could all be b@llocks!!
Has anybody had the inlets on the head polished and ported, and did this make any difference? What about trick multiple throttle body arrangements and or carbs has anybody tried these routes.
I think the general consensus is standard is good enough so just leave well alone "if it ain't broke, don't fix it!!"
Although this could all be b@llocks!!
Has anybody had the inlets on the head polished and ported, and did this make any difference? What about trick multiple throttle body arrangements and or carbs has anybody tried these routes.
I think the general consensus is standard is good enough so just leave well alone "if it ain't broke, don't fix it!!"
Apparently the whole 4.5 inlet thing is flawed anyway and the 4.2 inlets are better. Even better still would be the tuscan race inlets, which I think someone fitted to a purple cerby (along with NOS).
Porting the heads does help and is the basis of the red rose conversion I believe (along with higher CR and bigger injectors?).
I think someone fitted 4.2 inlets to a 4.5. Was it you Joolz?
Rob.
Porting the heads does help and is the basis of the red rose conversion I believe (along with higher CR and bigger injectors?).
I think someone fitted 4.2 inlets to a 4.5. Was it you Joolz?
Rob.
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