9 replies to this topic

[brookland]

As the title can anyone help me with the technical data for this camshaft. I`m looking for something close to a 997 cooper cam to use on a 998 engine and I have this one on a spare motor? Thanks.

 

[carbon]

The Piper HR270 has more timing and lift than the Cooper 997 cam.

 

Cooper 997 timing 16/56 51/21 (252 inlet & 252 exhaust) with 250 thou lift at cam lobe

 

Piper HR270 timing 22/62 64/28 (264 inlet & 272 exhaust) with 284 thou lift at cam lobe

 

Piper HR270/2 timing 28/64 64/28 (272 inlet & 272 exhaust) with 284 thou lift at cam lobe

 

See page 254 of Vizard's 'blue bible' for example HR270 power curve in a 998, comes on cam from 2000 rpm. DV also mentions that if you use this cam with high lift rockers in a 998 then you will lose up to 7bhp in the lower rpm range.

[brookland]

The Piper HR270 has more timing and lift than the Cooper 997 cam.

 

Cooper 997 timing 16/56 51/21 (252 inlet & 252 exhaust) with 250 thou lift at cam lobe

 

Piper HR270 timing 22/62 64/28 (264 inlet & 272 exhaust) with 284 thou lift at cam lobe

 

Piper HR270/2 timing 28/64 64/28 (272 inlet & 272 exhaust) with 284 thou lift at cam lobe

 

See page 254 of Vizard's 'blue bible' for example HR270 power curve in a 998, comes on cam from 2000 rpm. DV also mentions that if you use this cam with high lift rockers in a 998 then you will lose up to 7bhp in the lower rpm range.

Thanks for that. I have the yellow bible and it does not show anything on Piper cams, is it a good cam for the 998 and could you please tell me the full inlet degrees? Thanks :)

[brookland]

Anyone ?

[brookland]

Bump

[Vipernoir]

I think I've got an old HR270 sat in the garage if you need one.

[brookland]

Thanks but I have one. I just need to know the full inlet degrees after TDC to time it in and if its any good for a sensible 998 motor rather than a screamer. I`m guessing its more suitable for a 1275 motor but it would be nice to hear from someone that has used one on a fairly tame 998 with a standard air box, cleaned up 12g202, rc40 type of thing.

[andyt]

Sorry to hijack your thread but I'm building a similar kind of 998 engine with a 940 cylinder head and an MG metro cam, does anyone have the details for timing the MG metro cam?

 

Andy.

[brookland]

No worries, I can answer that one for you. The factory spec is Full inlet lift at 110 degrees after top dead centre :)

[Cooperman]

Suggest setting to 108 degs ATDC to allow for a 2 degree for initial chain stretch.

It should be a good cam for a 998, but use standard rocker ratio.