and i really dont the the cash to go down the turbo road i dont mind the work i am a mechanic n have a nice warm garage to do it all in so the labour aint that bad, i herd of these bored out throttle bodys floatin about this sit, do they give much increase
i think BBTB will offer you a better response, however not so many extra bhp. imo you should put some money in a good exhaust (meaning headers and decat straight pipes), that should be good for another 10bhp with your mods (chip and cams). also, a CAI won't hurt, it will raise the power peak a bit and give you another 5bhp, probably. i managed to squeeze 223bhp out of my M50 with chip, exhaust and CAI. no cams. so you should be a great deal higher than that with cams. BBTB is worth having, but i'd put my money in the exhaust first, if i were you.
regarding the head skimming, i was thinking of doing the same thing, that's how i came across this thread. still looking for feedback on this. one thing i would consider is how aggressive those alpina cams are, and how much extra lift they offer, you don't want to merge valves and pistons, i reckon. coz if the cams lift, say, 1.5mm higher and you skim 2mm of your head, that might be all the clearance the combustion chamber has.
anyway, keep us posted if you do find out something about head skimming and some proven gains out of this.
Unless you are doing some form of porting, arent you 'only' increasing the compression ratio?
What will the engine management do with this increase, perhaps retard the timing to compensate for any knocking and then you are back to square 1? Perhaps you need to also consider running higher octane fuel as a minimum or go with some form of throttle body setup to get the max out of increased CR and cams?
high octane fuel is a must after skimming, obviously, and it should be all right knocking wise as long as you don't go higher than 11, 11.5. at least that's what ppl generally say. still trying to find out if there's any significant gain, though..
If you go an m52b28(single vanos) engine you can bolt the b25 head on to it. You also get the benefit of a lighter engine. Or you could just shift the cams from the alpina head to the b28 engine. That is assuming alpina cams are just reground b25 cams
easy e is right. 227.9 with a DaveF, Scorpian cat back and a remap. Haven't done the M50 manifold + TB conversion yet, won't be long though. When i do i'll get it on the rolling road again as a comparison.
Might also get a run on a different rolling road to see if CCE's was putting out high/low figures.
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