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cosmo
07-08-2005, 10:11 AM
I am thinking of putting in a tac in my car but am wondering what red line is on my engine. the car is a 63, 170 OHV. I've figured that it is about 50 - 55 RPM. I was looking through my shop manuel last night but didn't see anything about it. Anyone know?

JDP
07-08-2005, 10:40 AM
I'd set it no higher than 4800-5000 RPM with that six.

Studebaker On The Net http://stude.com
64 R2 4 speed Challenger (Plain Wrapper)
63 R2 4 speed GT Hawk
55 Speedster
50 2R 10 truck

cosmo
07-08-2005, 10:53 AM
thanks, I'll do that.

Transtar60
07-08-2005, 02:44 PM
The truck version of the OHV six(1963 edition) has its max net 95 hp at 4300 rpm, max net 146 lbs.torque @ 1900 rpm. On the engine graph, the net hp and net torque lines cross at 2700 rpm.

cosmo
07-08-2005, 03:11 PM
So that means what, Transtar60?

studegary
07-08-2005, 03:20 PM
You usually run up to 10% over maximum horsepower rpm. That would be 4300 plus 430 equals 4730. I would redline your tachometer at 4800 rpm.

tbredehoft
07-08-2005, 08:06 PM
May we continue the discussion with information on the power range and top end RPM for a flathead 170? I don't expect it matters, but my Lark has a 4.09 rear axle and 3spd OD.

Tom Bredehoft
'53 Commander Coupe
'60 Lark VI

Transtar60
07-09-2005, 01:18 PM
quote:Originally posted by cosmo

So that means what, Transtar60?


Where the torque and hp lines cross are usually the "Sweet Spot" for the engines power band.

oldcarfart
07-12-2005, 10:20 PM
my 6 would fall on it's arse above 4000 rpm, so use 3800 as a shift point, it likes to torque not spin.

tbredehoft
07-12-2005, 10:29 PM
Thanks, Calvin, I can find 4 grand, sweet spots are elusive.

Tom Bredehoft
'53 Commander Coupe
'60 Lark VI