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I can't answer that, manifold design is something that is a bit of a art and something I know nothing about, I do know from experience that 1 in particular always works.
Like many things, plenty of experts but very few actually proving that with results.
For the sake of a few quid I'd definitely look into the BTB item, its proven and not really that much money in the grand scheme of things.
Is there a supplier you know of or would it just be BTB directQuote:
Originally Posted by Jonlem
SBD sell them.
My advice would be to PM Steveboyslim for anything related with parts you may require as he can sort them out at a better price.
As it happens I have a coscast head with + 2.0mm inlet and exhaust REC valves, piper double springs, steel retainers, arrow solid lifters, bronze guides, full ported (inlet and exhaust ports port bored) by roper developments piper cams, full built read to fit, £2600.
Steve
Eh? I cba then - I offered advice based on experience. You are just not willing to accept that we know more than you, 'cos we have been through the same thought processes.Quote:
Originally Posted by Gareth_C
Good luck in chasing 275 - it may happen on a dyno, but it will only happen once. The lifters will jack, snap your cams, snap your valves, munch the guides, crack all 4 pistons, snap the rods and bend the crank! ;)
what revs was the engine making the 263bhp on hydraulics? ive just had a failure on an engine due to poorly machined steel caps and lifters jacking up....and the car was only revved to 7.5k....(it had been hammered to 8k for a few months prior to rev limit being set properly.
i wouldnt take any hydraulic over 7750 tbh 8k at a push but even then id be a bit sceptic. its like kent for some stupid reason offers a hydraulic cam to peak at 8.5k for hot rods....youll be ****ting lifters and valves if ran that cam. same with their 8v cams they sell a cam with over 13mm of lift and a spring kit...yet their springs can only handle 12.5mm lift max!
where ever its ran 260 on hydraulics is either a **** rolling road for accurate figures or you have been mega lucky. as for the head a 27mm port bored +1mm head will do 270bhp or so.
heres my xe engine:
steel rods, cp slipper pistons, arp'd mains, fly, sbs headstuds, helix, ported head, colsibro guides, double springs, arrow solids, steel caps, RED wasted valves, newman full race cams, sbd pump gear, cometic, ported/polished, tony law ex manifold, lightened/balaned, etc etc cost about £7k in parts and machining, i did all own porting, shimming etc but thats a 9k engine built by a company. and its still on early crank and wet sump! built for around a genuine 250-260bhp@ 8k
http://i59.photobucket.com/albums/g3...g/IMGP2536.jpg
Cheers will Please we move away for the digs etc i did try and reply jonlem abouyt the resons i am reacting like this and thought that was it so could you read that post then understnd where this post is coming from ;)Quote:
Originally Posted by Will F
cheers philip engine looks nice the power dropped off around 7500 iircQuote:
Originally Posted by philip
Can I run +2mm valves on pot pistons as another thing SBD mentioned was the cut outs werent big enough fo rthe valves :confused:Quote:
Originally Posted by steveboyslim
The can be re-machined, increasing diameter and depth.Quote:
Originally Posted by Gareth_C
Steve
PS or could sort a +1.0mm valved head.