4x4, club cab will have some weight for sure, couple that with a tall tire and tight converter, yeah. It's why I recommended a relatively small cam. The 4.10 gears will help, though.
Cam recommended?..
- Thread starter j par
- Start date
-
But he's also got 4.10 gears. I think it'll be fine. If not, he can pick somethin else.
Who said anything about displacement? Not me.
I agree. Give Ken a call. He's a legend genius for sure.
j par
Well-Known Member
I don't know with a 4-in lift a 30-in tire might look a little silly...
j par
Well-Known Member
I'm not looking for a drag race cam that's for sure... I also wouldn't be happy if it fell on its face at 4K either...
That wasn't the point, the tire diameter will effect the final gear ratio.
heavy truck, factory stall and higher effective final gear ratio would factor in on which cam to choose.
j par
Well-Known Member
Are you sure..
If it quits pulling and faceplants at 4k, you have another issue...
for sure I'm sure.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
- Messages
- 26,622
- Reaction score
- 13,859
4.10s with 33s will feel like
4.10 x 26.5/33= 3.29s with 26.5s
That's a reduction to 3.29/4.10= 80%, looked at another way, your stroker could feel like .8 x 416=334 cubes, running a 3.29 rear cog. This is an oversimplification, that does not take into account the inherent torque increase of the stroker, but you get the idea, which is; It ain't gonna be pretty.
But, you know, some guys will argue that the stroker will make up the difference.
With 33s and 4.10s, the math says 65= 2715rpm@ zero-slip, in Top gear; Maybe 2800@3% slip. Pushing a wind maybe up to 2850@5% slip.
The thing is this;
with 4.10s, 5500 is 49 mph in First at 10% slip, 86mph at 6% slip in Second. But 60mph in Second at WOT might be just 4000 in Second.
So, while Rusty likes the 270* cam, and it is a good choice, at 60mph in Second, you are barely on the bottom of the power curve, and 26mph to go to the peak. So forget passing in a hurry at @ 55/60, for one.
Furthermore, taking off with gears that feel like 3.29s, even the stroker is gonna want some stall, in a W-200.
IMO
I think you need to rethink where you want the power to be; those 4.10s and 33s, might cramp you a bit.
------------------------
If it was me, I think I would like passing power cuz I don't like to be stuck behind a slow-poke that can't keep a steady speed for long periods of time. But here in Manitoba, most of our roads are just one-lane each way with usually graveled shoulders, so when I pull out, it's "hammer-time".
So to that thought, I'd be regearing it and/or bringing the power down to a lower roadspeed/rpm. Since our speed limits here are mostly 65, I'd be thinking of a 70 mph 2-3 shift speed, at WOT.
With 4.10s and 33s; 70 in Second gear, at WOT and 10% slip, is about 4660. So the power peak could be about 300rpm sooner or say 4400. That would get you into a 204@.050cam, (with a SBM), maybe a 212* with the stroker, so advertised might be around 256*. That will also give you some bottom end torque to pull that 3.29Effective gear, without a hi-stall. This takes us to;
But I like that 270Cam, with about 224@.050, which might peak at 5000, and could be shifted at 5300. So as for me, I might regear it instead.
That 224 will make a chitload of torque with a stroker, but to synchronize the power to passing, you would need 4.88s for a shift speed of 68mph@5400 in Second at WOT.
>At 55 then, at WOT in Second, the rpm will be about 4400; well up the power curve, and this will climb to 5400@68mph; obviously a very nice passing gear. But;
>65=3230@zero slip, perhaps 3360 on the tach at 4% slip.
>The Chrysler overdrive with loc-up would bring that down to 2230, about perfect for fuel-economy with that 224* cam.
--------------------
My 92 Dakota(5.2M) had a 4x4 overdrive, but I can't say if it was a 904, or a 727 based trans. I ran it with 3.91s and 28s for 65=2100 in od and locked up. Very Sweet.....
Last edited:
He could have already bought the cam he is going to use. It wouldn't be the first time he asked for opinions and already had the part on it's way... LOL.
j par
Well-Known Member
I could have the cam already...
j par
Well-Known Member
67autocross
A new iron curtain drawn across the 49th parallel
I know you gots the cam already but I have a comp 274H in my square body with 33’s and 4:10 gears…. 350 SBC 30 over good ported factory heads 9.5 comp…750 Holley VC 3 speed trans…great combo for short trips doing 60mph max…faster than that and it goes through fuel without pity
I'll add this and then I'm done. Yall are all forgetting one thing. When making comparisons across solid to hydraulic, a solid will act 10* smaller, so he's really talking about the same as what would be a 214@ .050 for that solid comparing to a hydraulic.
The 270s is as close to perfect as an off the shelf cam will ever be. Thank you, drive through.
The 270s is as close to perfect as an off the shelf cam will ever be. Thank you, drive through.
He needs to call Jones and get one of those custom inverse whatchamacallits or Howard’s for a custom grind using lobes with the #15 notation (you know, those magical fast rate lobes
) Anything else and he’s just leaving power and torque on the table, giving up that Chrysler advantage
) Anything else and he’s just leaving power and torque on the table, giving up that Chrysler advantage
....and the regugitory drama continues.
whenever RRR post this ^^^^ it's a guarantee there will be at least 9 more post by him
whenever RRR post this ^^^^ it's a guarantee there will be at least 9 more post by him
It's not a bad thing either.j par
Well-Known Member
I pulled a @318willrun on @318willrun ....
He makes a false suggestion and then I lead him to believe it's true but giving half information...
As in I do have a cam but it's an old 360 Factory cam that I could give to Ken for him to grind into what I want.. but as far as having my cam chosen and having it already that's just something that he made up.
FYI to everybody this is what I do have..
I have the heads from the Duster..
I have a brand new gasket kit..
I have the truck oil pan and pickup..
I have the Speedmaster intake from last Black Friday still in the box...
I have a good use set of crane roller rockers.. and some push rods for hydraulic lifters.. I doubt if they're going to work for a solid lifter...
I have the block at the machine shop 90% paid for and it has been bored and honed but not final washed and cam bearings installed yet.
I have the stroker kit paid for and ordered but I called Scat and they said they have the material for the rods but won't be punching them out till mid next month...
(The only thing that's holding the kit from being sent..)
mopowers
Well-Known Member
whenever RRR post this ^^^^ it's a guarantee there will be at least 9 more post by him
It ain't just him.
You be quiet. lolwhenever RRR post this ^^^^ it's a guarantee there will be at least 9 more post by him
Post #22.
Displacement has plenty to do with duration. Greater vacuum [ or suction ] is created by larger displacement which pulls more weight of air into the cyl.
As already prescribed, the 270S is a great choice by the OP. This cam was originally marketed as a 'variable' duration cam; the seat duration can be varied 10* because the range of valve lash is 0.015-0.030". So some built-in tuning flexibility.
Displacement has plenty to do with duration. Greater vacuum [ or suction ] is created by larger displacement which pulls more weight of air into the cyl.
As already prescribed, the 270S is a great choice by the OP. This cam was originally marketed as a 'variable' duration cam; the seat duration can be varied 10* because the range of valve lash is 0.015-0.030". So some built-in tuning flexibility.
-
Similar threads
