Small Cam Choice?

[LIQUIDLOUNGE]

I just bought a 2L FI core that I'm going to carburate. I'm sending the motor out for a rebuild and I'm sure I will have the compression upped with new pistons. I thought I might want to do a small cam (maybe more modern?) I do want to be able to putt-putt the motor in 1st gear with no throttle like I can now with the stock cams. I also want a smooth idle. I want no more carburation than a 34 adf would provide. I was thinking that Allisons 274fi cam might be nice even though I'm going carb. Any other ideas? Everyone talks about the 40-80 cam (what ever 40/80 means) but I think the cam might be a little big and a little old school. Maybe I sould just leave the cams stock, but I know valve timing event philosophy has changed in the last 30 years and I would like to take advantage of it If I can. Any Ideas? Thanks! Dave

[So Cal Mark]

if you're not going to rev the engine above 6k, don't use the 40/80 cams. For most street motors we recommend our 285v cams, but if you mostly want midrange, the 274fi cams will work nicely

[divace73]

don't get rid of the FI, standard it can manage with small amount of changes of if you want tunability and improvment just Megasquirt it.....
As far as CAM choice, I'm not experianced enough in that area but others will chime in and help, you may need to put more specs of your engine though...

[LIQUIDLOUNGE]

The FI is coming off for several reasons (all good I might add ) I've spent the last 30 yrs modifying (and fuel injecting) toys and I've really come to appreciate cubic inches and hydraulic roller cams the most. Although I dont recall the technical name for the phenomenon, I do know that a jump in displacment will diminish the some of the negative effects of reversion/overlap that longer duration cams present. I just dont know if going from 1.8L to 2L is going to be enough to try the 285 cam and still retain a stock-like idle and nice low speed manners. Mark?

[vandor]

Hi,

If I were you I'd build the engine with stock cams, drive it for a bit, and then put in the cam of your choice.
A pair of Mark's cam would work well, I'm sure. Now I am running a 40-80 on the intake side and stock cam on the exhaust side.
It acts like a stock engine as far as smoothness goes, but it has more power. I used to run the same engine with both 40-80 cams, and it had more power, yet Iit would drive just fine at 2000 rpm in 5th.

[So Cal Mark]

my 285v cams are smooth enough to pass smog checks here in Calif. If you idle the motor at less than 1000rpm it has a very slight lope. Unless the car is FI, I use the 285v cams in almost everything. I've had customers dyno their engines and these cams are versatile enough for an otherwise stock motor that has to pass smog checks, or make 170hp in a modified motor