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idle speed for pinto??
iscmatt - 8/5/07 at 11:44 AM

what is the ideal idling speed for a Pinto with FR32K Kent Cams, i.e 1200 RPM or a bit higher (because it is a fast road cam).

thanks to anyone who can help!

flak monkey - 8/5/07 at 11:47 AM

Mine will idle at 800rpm with an FR22 (which is essentially the same) which i was suprised about. Its a it lumpy though, and doesnt like sitting there for long at that speed.

Would suggest 1000rpm would be ok, and thats what mines set to now, quite happy to sit and idle for hours. Basically you need it ticking over as slow as possible, but running ok. So just have a play around with it.

Will also depend to some extent on how much advance you are running. Mines set at 14deg @ 1000rpm.

[Edited on 8/5/07 by flak monkey]

mookaloid - 8/5/07 at 01:18 PM

Mine will idle at 900rpm no bother Fr33 cam twin 45's

Cheers

mark

ditchlewis - 8/5/07 at 01:18 PM

mines about 1100 with an FR32 cam. if i take it below 1000 rpm it stalls.

ditch

DarrenW - 8/5/07 at 01:26 PM

Mine will tick over happily at 8 - 900 with FR32 cam.

How did you get more that one cam in yours (ducks for cover!!)


The FR32 is quite a smooth cam and power delivery is relatively civilised.

jacko - 8/5/07 at 03:44 PM

Mine is 800-900rpm with piper 285 cam and zx9r bike carbs
Jacko

iscmatt - 8/5/07 at 03:53 PM

quote:
Originally posted by DarrenW


How did you get more that one cam in yours (ducks for cover!!)


whoops good point! there is only one in there, i think! might have to do some adjustments then, thanks for help.

mark chandler - 8/5/07 at 07:27 PM

You should be able to get a reasonable idle at 900 rpm, if you have optomized the carbs and ignition then I suspect the cam is probally out.

You need around 5 - 7 degrees advance on the cam to maximise mid range, this will also improve the idle.

If the cam is set at TDC then although at max RPM the engine will be a bit more powerful, but ask yourself how long you will ever drive constantly at that point, idle and mid range will however suffer at this setting.

If the cam is after TDC then it will be hard to get a good idle below 1000 rpm and you lose power all the way.

Rgds Mark


[Edited on 8/5/07 by mark chandler]

flak monkey - 8/5/07 at 07:35 PM

quote:
Originally posted by mark chandler
You should be able to get a reasonable idle at 900 rpm, if you have optomized the carbs and ignition then I suspect the cam is probally out.

You need around 5 - 7 degrees advance on the cam to maximise mid range, this will also improve the idle.

If its at TDC then although at max RPM it will be a bit more powerful at max revs its doubtful you will ever drive constantly at that point. The idle and mid range will however suffer.

If after TDC then it will be hard to get a good idle below 1000 rpm.

Rgds Mark


Ideally the pinto wants between 12 and 14deg BTDC advance with the FR32 cam - set at 1000rpm. After you have set it you can adjust the idle speed to something more suitable.

If you are running the std dizzy, you will need to either modify it to limit the total mechanical advance (otherwise you will have too much) to 36-38deg BTDC all in at 3500-4000rpm. Or you will need to buy a modified one (have a word with H&H ignition solutions) or use megajolt. Modifying the std one is acceptable, but you wont have the optimum advance curve. If you want the full performance you need to buy one to suit your engine, its amazing how much difference the correct dizzy can make.

David

mark chandler - 10/5/07 at 07:39 PM

I was suggesting you set the cam advanced at 5 - 7 degrees, the ignition maybe needs as much as 14 degrees but this depends on the distributor advance curve etc.

At 6000 rpm the ignition should not be over 36 - 38 degrees advance so do not overcook it.

Regards Mark