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Post by jonrowe on Feb 23, 2013 21:06:58 GMT 1
I've just put a piper BP300 spec cam in my newly built engine. They tell me it's profile is similar to that of the ones used in a pinto.
So far its not producing any increased power(the cam timing has been doubled checked as has everything else!)). Has anyone else been down this route, or can you recommend a different profiled cam.
The head has been ported, twin webber 45's and bespoke SS exhaust to the right lengths and diameter.
I'm after a rally, not full race spec engine.
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Post by datsfun on Feb 23, 2013 22:25:48 GMT 1
Jon I doubt it that anyone in the UK can give you accurate feedback regarding 4 cylinder L series tuning and their experiences. My suggestion would be Stewart Wilkins Motorsport or Datsport in Australia. They will be able to guide you regarding the correct cam profiles and supply correct parts, shims etc...in my opinion, piper do not have experience of 4 cylinder L series which is why they base their tuning on the ol pinto!
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Post by jonrowe on Feb 24, 2013 12:25:49 GMT 1
Thanks for the info, I've contacted S Wilkins and waiting for a reply. I've also found a company(ISKY racing cams in Canada) who print a cam card in their catalogue for the 5 cams they do for that engine. The prob is I don't know what difference duration or lift will make!
Jon
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30psi
club Member
Posts: 166
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Post by 30psi on Feb 24, 2013 14:40:53 GMT 1
Iskendarian have some sensible profiles looking at their catalogue. I'd only consider using the stage 1 or 2 cam. That BP300 spec cam is a race cam to be fair and requires very high revs and will be best suited in a light car with diff and/or gearbox ratios to encourage high revs.
What are you revving the engine to and what else has been done to improve tjhe breathing? Is it still on a standard compression ratio?
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Post by jonrowe on Feb 25, 2013 18:59:10 GMT 1
Just back from dyno.....
113bhp at 6000rpm, thats with the 318 duation and 106 full lift cam, ignition set at 33 degrees,compression ratio is 11 to 1 using 95 + an octaine booster.Filters are off the end of trumpets at the mo.
Is this good for an L16? The car has been built in race/sprint spec and wieghs in at 1050kg(still loads to loose)
I was hoping for around 120bhp but this seems usuable.
Next step, try and find a 4.1 or 4.4 diff
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30psi
club Member
Posts: 166
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Post by 30psi on Feb 25, 2013 19:20:32 GMT 1
What RPM was peak torque and power at?
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Post by Al Ramone on Feb 25, 2013 19:43:20 GMT 1
is that power at the wheels?
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Post by jonrowe on Feb 25, 2013 20:00:27 GMT 1
peak torque/power:100 @ 5100rpm
Al:- at the wheels
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Post by Al Ramone on Feb 25, 2013 20:10:21 GMT 1
so say 140 at the flywheel, doesn't sound bad.
i think the 45's are too big thou. i'd want at least 160bhp to make use of a pair of 45's
stock size valves?
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Post by jonrowe on Feb 26, 2013 19:35:27 GMT 1
Yes stock valves.your old 1.8 is next I think
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Post by Al Ramone on Feb 26, 2013 20:15:47 GMT 1
the only way your gonna make more power out of that 1600 would be to get more revs out of it. and i'd guess the valves and the current porting is just not enough to do it?
oh and you asked about camshafts.
more duration and the overlap that goes with it, pushes the torque curve higher up in the rev range.
higher lift on it's own, normally keeps the torque lower in the rev range.
i'd be looking to the US for your camshafts. they seam to be a bit more clued up then the UK firms, plus i'd have thought there would be plenty of guys over there who are tunning/have tuned, the Nissan L series engines.
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