maximum rpms for a 200ci

[Anonymous]

ive heard that a stock 200 will rev to 7k, is it true. what should i expect from my 200 once i get a late model head, port divider and headers, 3x1 or 2 barrel carb with a stock bottom end.

Properly built a 200 will go to 6000 or above. Dont have a clue about a 250....

With the specs you posted I would think it would wind up to 4000-4400 before it will run out of steam with a stock cam. Switch cams and you caould probably shift it from 4600-5000. I wouldnt go beyond that without more mods and ARP rodblots.

When I race I shift mine between 6200-6400 and shift it regularly on the street at 6 grand.

No big deal.

Balanced, performance balancer, ARP rod bolts and roller rockers, performance pushrods are all that is necessary. And like Jack says, your engine has to have the ability to actually be able to reach and use those engine rpm's.

Just winding it up for the sake of doing it is stupid. Winding it up to 6400 rpm's and making horsepower is fun!

Later,

Doug

 

[Inline6Merc]

powerband those numbers are with a 200cubic inch motor.

 

[rancheroman]

For what its worth, I would wind my 170 (4 main bearing) to 6000
on every run I made in land speed racing, and I raced the engine
for 3 yrs. along with driving it on the street and to and from
Maxton N.C. (700 + miles, one way). Before I removed the
engine (spring of this yr.) it had a bottom end "death rattle"
at anything over 5000 rpm. This engine was equipped with a
'argie' head, intake manifold,split exhaust manifolds, and
new isky valve double valve springs, along with a clay smith
cam,(272 I think, I can't remember right now as I write this.). I had a lot of fun and turned a lot of heads
with this engine when it was in the Ranchero. Thats my 2 cents
worth. Paul.

 

[rickwrench]

The max theoretical safe rpm of an engine is determined by stroke, rod length, and rod material.
The G forces (acceleration/deceleration) that will tear a rod in half occur at vastly different rpms, depending on these factors. A 200, with a relatively short stroke of 3.126" will safely sustain much higher rpm than a 250 with a 3.9" stroke.
Ford 289s and Buick 215s are "safe" to 7200rpm because they used forged rods and had a very short strokes of 2.87"and 2.80".
You'll never get to those numbers with any street engine, though, as the valves will float at not much above 6000rpm, unless you are running -real- heavy valve springs.
Find a piston speed/acceleration calculator online, and you can see what the differences are.
Rick(wrench)

 

[Patrick66]

I ran some virtual dyno runs and this is what i came up with:

1. 2barrel 500cfm, dual out headers, late model head, better valve springs, stock cam (for now) and somewhere around 9.0:1 compression, mild porting. DS II, msd blaster 2 coil,

172hp @ 4500rpms
209ft·lbf @ 3500 rpms

if you add a Classic Inlines cam like say 264 grind you get:
191hp @ 5000rpms
224 @ 3500 rpms

Hope that helps.

curtis

172hp with a stock cam and internals, thats pretty good. how about with a smaller carb (somewhere between 300-400cfm)? and what about with 3 weber 34 1bbls (150 cfm each) dont mean to waste your time with this, where did you get the software. that way i can do it myself and try a bunch of different combos to see what power they will make.

 

[Inline6Merc]

2barrel 350cfm, dual out headers, late model head, better valve springs, stock cam (for now) and somewhere around 9.0:1 compression, mild porting. DS II, msd blaster 2 coil

165hp @ 4500rpm
204ft·lbf @ 3500 rpms

same setup with three 1bbl's at 150cfm a piece

is the same as the 500cfm two bbl give or take 1hp. in real life you might see better gains since the fuel is distibuted even amongst the cylinders.

the program ive been using is Comp Cams dyno simulator.
Just pm me with various setups and ill run the numbers and givem to ya.

curtis

 

[Bort62]

Those Virtual Dyno's are pretty worthless, btw.

They won't tell you anything that anyone who has half a clue couldn't tell you off the top of their head.

 

[Patrick66]

thanks curtis.

are those numbers for the rear wheels or at the flywheel?