Cam swap
 

Hey all. I've done alot of reading about swapping the curvy inlet cam for a pointy one, and using the curvy inlet as exhaust.

As this seems a nice and thrifty mod (we like), I am maybe planning on doing this. But thought I'd ask the seasoned vet's about post swap performance, (if you'll endulge me)

Am I right in thinking that I may gain a bit of top end?

And does this top end gain, result in any low/mid range loss? (I do love the low down torque).

Thanks in Advance

Richie K

Re: Cam swap
 

I've got JHS cams fitted which are supposedly a bit peakier still and it doesn't feel any weaker than standard at the bottom.

Re: Cam swap
 

and Ive got a set of JHS cams I may be looking to unload... ;)

Re: Cam swap
 

iv got some pointy spares inlet and outlet cams with sprockets and carriers

pm me if interested

Re: Cam swap
 

Would changing the cams to "hotter" ones mean I would have to check valve clearances more often?

Richie K

Re: Cam swap
 

No, just checking them when you put the new ones in!

Re: Cam swap
 

I've been checking mine every other oil change (so every 7k miles) just to be on the safe side but they don't seem to need it.

Your results may differ.

Re: Cam swap
 

I dont do that many miles, and its due its valve clearances checking in 1000 miles anyway. So no bother there then.


Cheers

Richie K

Re: Cam swap
 

My 1999 curvy before changing the cams:
www.johnnyrod.co.uk/dyno2.gif

and after
www.johnnyrod.co.uk/dyno3.gif

All teh bottm and midrange is there, plus extra top end, no changes needed in the carbs. I read up on this a lot before I did it and everyone else said the same things as well. Well worth it, picks up again over 7000rpm and opens a few eyes on the track!

Re: Cam swap
 

Johnnyrod, cheers for the dyno graphs.
I am definatley gonna get it done, once I get some pointy inlet cams.

Richie K