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440 Chrysler max RPM

K

knoteasy

New member
"I am trying to fit my boat wi

"I am trying to fit my boat with new props and don't really know what the max rpm is, 3800,4100,4200 I have no specs on the engines can some one please help fishing season is almost here."
 
Max R.P.M. is 4000. I have a 4

Max R.P.M. is 4000. I have a 40 ft. jersey and the props are 3 bladed 23x23 using Chrysler 440's. Shoot for 4000 or just a hair under.

Captain Ed
 
"Thanks for the input on max R

"Thanks for the input on max RPM on a 440, my 440's are in a 75 ChrisCraft 30TSF I have 19x19 props, so the stamping on the prop says. I get about 3800RPM @ W.O.T speed is around 30kt, cruise @ 20kt 33to3400 RPM and burning 13to15 GPH per motor, this why I think it's in the prop.Any suggestions please let me know. The engines are suppoedly 330hp?"
 
"Tommy,

You are pretty clos

"Tommy,

You are pretty close to rated RPM. Check your timing advance springs/weights in your distributors. Look under the rotor cap and you will see a silver botom plate under the pickups or points. You should be able to see through a hole in the plate that there are weights held by springs under the silver plate. If the springs get rusty, they won't advance your timing correctly. You can wiggle the rotor and see the weights move. A little silicon spray may help lossen them up. Make sure your timing,cap,rotor,wires and plugs are all good. Another thing to check is your exhaust manifolds,risers, and elbows are all clear of rust clogging them. After checking all of these and replacing my exhaust (90% clogged water passages), I got my RPM's to 4000 WOT from 2600 WOT. Your RPM are only 200 short of rated power.I would rather be here than over. You will get more speed and a little less wear (lower rpm) on the engines. If it really bugs you or you can borrow a prop, decreasing your pitch 1 degree will increase RPM by 200 (as a rule of thumb).

Good luck!"
 
"Captin Ed

Thanks f

"Captin Ed

Thanks for the input, I know its not in the ignition system all brand new mallory distributers and wires plugs are NGK's, all that crap cost a few dollars. The man's and risers I will take a look at, also because I am getting alot of steam out the back.

Tommy D"
 
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