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Which Camshaft???
locostmac - 25/8/05 at 10:01 PM

I am just rebuilding a pinto 2.1 at the moment, it has a big valve head its been ported etc etc and will be running twin dellorto 40's
Which is the best cam for me to put in it?

NS Dev - 25/8/05 at 10:02 PM

on a ported and big valved 2.1 pinto, you'll need 45's for a start, 40's will be too small.

locostmac - 25/8/05 at 10:04 PM

I bought them as a set, the 40's have been jetted and set up for the engine? Will a set of 45's make a big difference?

NS Dev - 25/8/05 at 10:15 PM

who did you buy them from?

Yes, on a std pinto 40's are about right, but with bigger valves and another 100cc's, plus a bit of porting, you'll be hitting the limits of the 40's, unless the head job is crap!

On the original question, depends how easy you want the engine to be in traffic etc, but I would say you will want it to be well behaved and nice, and a Kent FR33, on a 2.1 pinto, will fit the bill nicely. An FR32 will be even nicer but with less top end.

locostmac - 25/8/05 at 10:19 PM

Bought them from my brother, he took them and the 5 speed box out of his seven when he stoved it!

The head work looks very very good to me, but then i am no expert!

I took the engine apart to check everything but it all seems excellent, i dont think it has covered many miles

locostmac - 25/8/05 at 10:56 PM

The cam in there has KC FR22 stamped on the end, is this the standard item?

stevebubs - 25/8/05 at 11:36 PM

No sounds like Kent Cams Fast Road

gazza285 - 26/8/05 at 05:10 AM

More important than whether it has 40 or 45 carbs on it, what size is the main venturi as you can have 40s with venturis up to 36mm and 45s down to 34mm. I keep being told that the 45s I have on my 1300 crossflow must be too big, but I know what size venturis I have and they don't.

NS Dev - 26/8/05 at 07:15 AM

quote:
Originally posted by gazza285
More important than whether it has 40 or 45 carbs on it, what size is the main venturi as you can have 40s with venturis up to 36mm and 45s down to 34mm. I keep being told that the 45s I have on my 1300 crossflow must be too big, but I know what size venturis I have and they don't.


that's exactly right, didn't go into that as I didn't want to get over complicated, but with a 2.1 pinto and big valves etc, you'll need a bigger venturi than you can get in a 40 (dcoe or dellorto). Only answer then is to bore out the venturis, which makes the fuelling iffy, as you lose signal strength over the jets.

Details (from Dave Andrews kindly posted diagrams) are here:




as you can see, revving to 7000rpm (which with either an FR22 or FR32 or FR33 you will do) then you need 40mm venturis. The biggest that will go in a 40 dellorto is a 36mm venturi.


As you can no doubt also see, for a 1600 engine such as a crossflow or 1600 pinto, 40's would be fine as you need 34-36mm venturis (chokes to a lot of people by the way, just in case your rolling road man uses that wording)

Re. the camshaft, if it's good, then hang onto the FR22 that you have. It will be fine, if possibly a bit on the conservative side for a 2.1 pinto. It will be very "grunty" with that cam and have heaps of torque. If you want a bit more top end then look out for an FR33 in the meantime.

You definitely want 45's on it though, sorry, as I know that's not what you wanted to hear, but they will improve it no end.

[Edited on 26/8/05 by NS Dev]

locostmac - 26/8/05 at 08:15 AM

Thanks for all your help, looks like i best get a set of 45's on order then

I saved myself some money on a cam tho, so thats not so bad .

Mart

James - 26/8/05 at 10:37 PM

Mart,

What sort of power output are you after?

Worth having a read of this excellent guide from the Puma guys:

http://www.pumaracing.co.uk/pinto.htm

HTH,
James

locostmac - 27/8/05 at 09:04 PM

I was hoping to get 130/140 bhp ish , what should i get if this lot i have is set up properly?

NS Dev - 28/8/05 at 09:52 AM

a lot depends on the head. If it is well ported, has a decent raised compression ratio, big valves and that cam then 140hp should be a cinch.

150 hp is certainly attainable with little problem, particularly if you went for the FR33 cam in the future (just remember that you need a vernier wheel for it, dirt cheap second hand, can't remember if you said you had one already)

locostmac - 28/8/05 at 10:10 AM

I took the head to a local specialist who said there is nothing more they can do in the way of porting and said the job had been done properly I am going to see what its like with the FR22 cam as its not so much of a problem to change it in the car!
One problem i do have is whilst taking the engine to bits the timing mark on the top pulley has moved ( well the disc behind the pully), I am wondering how i now tell if the static timing is correct?
The engine is all back together apart from the ali sump and rocker cover
Anyone have any ideas re the timing mark?

[Edited on 28/8/05 by locostmac]

mookaloid - 28/8/05 at 07:35 PM

You can use a dial gauge on number 1 inlet valve and protractor on the crank pulley search for Fr22 on here for the setting

http://www.kentcams.com/index.htm

HTH

Mark

locostmac - 28/8/05 at 08:55 PM

Thanks mark, i will get that sorted tomorrow then