cam question

[91 HATCH]

Is there enough room for this cam with the 1.7 rockers on a stock 1993 motor or should i just use the 1.6 rockers

lift .480 w/1.6 rockers
lift .516 w/1.7 rockers

duration 220@ 0.50 intake
duration 226@ 0.50 exhaust
lobe seperation 112

 

[ninety15.0]

yup plenty of room...search around there are plenty of guys on this forum running 1.7's on stock motors!

 

[88mouse]

Is there enough room for this cam with the 1.7 rockers on a stock 1993 motor or should i just use the 1.6 rockers

lift .480 w/1.6 rockers
lift .516 w/1.7 rockers

duration 220@ 0.50 intake
duration 226@ 0.50 exhaust
lobe seperation 112

Plenty of room. You really don't have to worry about PVC untill you get to around 540 lift and up.

 

[cenok is family]

looks like you're running a B cam? if so, i've seen tons of people running 1.7's with the B cam.

 

[91 HATCH]

The cam is a steeda #18 street/strip cam

 

[5spd GT]

Always a good idea to measure, but you should be okay...but no guarantees.

By the way, a piston is heading down the cylinder bore a good 2" when the cam lobe is at peak lift.

Duration, ramp rate, overlap, individual valve timing, etc, all play a roll in piston to valve clearance.

The stock cam peak lift of .444 could hit the piston if it is had a serious ramp rate and very early intake event or late exhaust events. Lift is the minimum to consider when seeing if p-v clearance problems will occur.

Adding more rocker arm (1.6 to 1.7) also slightly increases duration, maybe 1-2*