3200 high stall

[Gunns VC]

Hi guys. I am just wondering if a 3200 high stall would go alright with my motor combination. My motor has 10.5:1 comp, flat tops, dual plane high rise manifold, 1000cfm throttle body, worked heads, solid lifters and most likely a crane 280 cam + other good bits. I am planning on racing it until I get off my p's then I'll use the car for cruising on weekends most likely! Also have 3.9 diff gears if that makes a difference?

If I have left anything out let me know, I just wanna know if it will be too big!

Cheers.

[DANNY8]

The Crane F280's power range is 3400-7200....so ideally ya wouldn't use a 3200rpm converter. My new motor has a F280 and I'm using a 4000rpm converter...just to be safe.

[Gunns VC]

Stupid me I should have checked the cam specs first! Would it really matter that 200rpm difference? Is there a similar cam to the 280 that is good for a little less rpm that anyone can think of off the top of there head lol?

[Gunns VC]

Just had a quick look on the crow cam catalogue cause I couldn't find anything similar on the crane catalogue and I came across a crow 4731, rev range 3200-6500 which would be alright cause the 3200 would suit the hi stall and my manifold rev range is between 1200-6500. What does everyone think?

[padrickz88]

I think just go with a bigger stall then 3200, I have been in a car with a 3800 and it wasnt bad at all...

[Blown V6 Hatch]

Add 500rpm to where the cam starts making power and that's a rough guide for stall speed.

I.e. F280 starts making power at 3400 = 3900 stall speed. Close enough to 4000rpm.

[Gunns VC]

Oh ok thanks for that guys. I have a mate that is selling a 4200 stall, would that be to big for what I need ?

[DANNY8]

With the F280 I'd much rather a 4200rpm converter then a 3200rpm converter...just means a few more revs.

[ari666]

3200 would be perfect for a 286 crane

(gimmie it! lol)

[Munz]

I was thinking the 3200 would be ok due to your diff gears (3.9) as they move your powerband to a lower rev range

[Gunns VC]

I was thinking the 3200 would be ok due to your diff gears (3.9) as they move your powerband to a lower rev range

I'm not too sure about the technical side of rev ranges etc. Does anyone else know much about it?

[ari666]

technical side?

[Gunns VC]

Like what munz Said about the 3.9's changing the powerBand to a lower rev range etc

[ari666]

it doesnt change the power band, it just means the engine revs up quicker. you still need a converter to engage fully at start of your power.

[Munz]

Ari i was under the impression that a car with lets say 3.08 diff will create peak hp @ 6200 but a car with 3.9 will peak around 5600-5800 mark

All my cars have had there peak hp move to a lower rpm with a diff gear change

[ari666]

i cant see the diff ratio changing the power of the engine. after all its not an engine mod. the dyno will read different torques at different rpm's but it will work out to the same kw figure.

Horsepower = torque X rpm / 5252

RevSearch Engine Dyno; Torque vs Horsepower