1933 plymouth top speed

[lanny haff]

hello it;s been a while since I last had anything to say or questions. I have a 33 plymouth coupe with a 48 dodge 230 6cyl. it has amilled head .060 split manifold 3carter-webers + afull race cam. it;s hooked to a 350 turbo hydro + has 12 bolt rear, econline front axel with chevy disc brakes it cruises pretty good but what should the top end be about what is the top end on a 48 dodge? thanks lanny haff

[greg g]

depends on the size of your tires and the rear end gears. There are ay number of caculators on the web where you can enter variables like top gear ratio, top rpms, rear end ratio and tire diameter and it will spit out a speed. And while they do not take into consideration for things like rolling resistance, aero drag, and wind speed, they will get you into the neighborhood.

Of course there is the old fashioned method, of finding a stretch of straight and level sparsley traveled road and holding down the gas pedal till it won't go no more....

do a search for speed, rpm calculators.

I would put my money on some where just north of 90.

[TodFitch]

hello it;s been a while since I last had anything to say or questions. I have a 33 plymouth coupe with a 48 dodge 230 6cyl. it has amilled head .060 split manifold 3carter-webers + afull race cam. it;s hooked to a 350 turbo hydro + has 12 bolt rear, econline front axel with chevy disc brakes it cruises pretty good but what should the top end be about what is the top end on a 48 dodge? thanks lanny haff

I've had my stock '33 PD up to 70 MPH. That's with the original 70 HP 190 cu.in. engine with the original 4.375:1 rear end and narrow 17" tires. Speed verified by GPS. Ran out of the level stretch of road at that point but I don't think it would have done much more. Mine is a two door sedan, a coupe with a bit less weight and better aerodynamics would probably do more. As would a '33 with the 4.11:1 rear end used on the PC.

However you aren't asking what a '33 Plymouth will do. You are asking what your one off custom drivetrain will do. A question I can't answer.

I will say that if you are trying to go much faster than 60 MPH you will want to swap out the original brakes and do some other suspension modifications. Certainly the passenger I had when I did the 70MPH got awfully quite and seemed a bit concerned as the speed went up.

...I would put my money on some where just north of 90.

Definitely will need suspension and brake improvements for that type of speed.

[lanny haff]

TODFITCH Thanks for your reply. My car had a 327 chevy boat anchor in it when I got it I got an adaptor from Wilcap + hooked my Dodge engine up to the 350 GM trans It still has the 12 bolt rear + GM discs on the front, It handles well + stops on a dime. With the chevy it was well over a100 mph many times. The only reason I switched engines is because IT AIN'T SUPPOSED TO HAVE NO STINKIN' CHEVY MOTOR IN IT! Besides it is much different with the flat head Dodge. I went to the old car meet up 1 night + my daughter said to me dad how come every one comes over by your ratty old car when theres 's so many really nice cars here. I told her mine was something different. It has cool factor

[randroid]

Lanny,

You may have just gone down in the history of this forum as one of the few, if not the only, member to swap-out an SBC for as close to original as you can get. When asked about running an SBC many have said to put it back original because Chevy engines don't belong in our Plymouths but I have not read about a single member doing it until now.

You're my hero.

-Randy

[lanny haff]

Randy I'v never been anyones hero before [ except maybe my wife's] Thanks I don't really understand why people ruin nice old cars by putting different brand motors in them especially mopars. There aren't many sbc that can beat a 340 mopar a good running 383 or 440 is a match for most bbc. hemis are another matter. It has been said if you want to go fast drive a Chrysler. Mopar flat heads forever, + they'll probably last that long Lanny