71duster383
Member
I would be happy with 320 at the wheels too. But it’s only 230 at the wheels.320hp at the tire is a good combo . As was posted before : tune, tune , tune . I have a 383 Scamp and would be very happy with it .
I would be happy with 320 at the wheels too. But it’s only 230 at the wheels.320hp at the tire is a good combo . As was posted before : tune, tune , tune . I have a 383 Scamp and would be very happy with it .
I've always said 4.11's is lower geared than 3.23's.Finally, someone knows how to talk gears. Numbers go down it's LOW they go Up it's geared HI.
I got you.I've always said 4.11's is lower geared than 3.23's.
Kind of like "low gear" on a tractor is geared for more power. Or 4-low on a 4x4. Or granny low on a 4 speed truck. Or 1st gear on a 727 could be called "low" gear.
He's talking about this camshaft.
11-651-47 - XTREME Energy™ Hydraulic Flat Tappet Camshafts with 18736542 Firing Order 4 & 7 swap firing order.
Hardly low lift for a hydraulic flat camshaft. That's a stout camshaft for a stock stroke 383. Which is what we're talkin about here, not a stroker. Apples to oranges and does the OP no good. Lets keep the discussion down to what he HAS so we can better help him. Ok?
To the OP, first off, how does the car RUN? I mean omitting anything you have learned dyno wise? Are you happy with it? Will it smoke tires? Does it accelerate briskly? It may well be fine, because it's possible to lose 100 HP through the drive train.
That said, here's where "I" recommend starting. First, run a compression test and post up the numbers. This will give us a good idea about the static and dynamic compression ratios of the engine. My guess is, it will be 120 or less. We can better advise you with compression test numbers so get crackin and let us know.
You have lots of options. You can taylor the camshaft timing to better match the initial cylinder pressure readings. If they are low, you can advance the camshaft timing. If that engine has stock compression pistons in it, I would put that cam somewhere around 100-102 ICL. But that's getting ahead of ourselves. Lets get those compression test numbers first and we can go from there, ok?
did he see the 4 & 7 swap in the firing order?
Put the kids to bed last night and went straight to the garage to get some compression numbers. Compression ranged from 135-145psi.
That's consistent and that's a good indicator that the engine is in decent shape. A little low. Do you know if the camshaft was degreed or was it installed dot to dot? If dot to dot, it might be worth your time to degree it. If you don't want to go to the trouble, then we can move onto getting the ignition timing optimized. I would recommend looking at the camshaft timing though, because getting camshaft and ignition timing both where they need to be can add a lot. Up to you though.
Well, probably not so much. There is the thing with how horsepower was measured back in the day... almost as confusing it seemsYes , @ 230hp something is WAY off .
Here is a little different approach for you for some more "Seat of the Pants" performance.
What type of wheels are you running, are they steel ? There is a comparison between the weight of the Steel Wheels and the much lighter Aluminum Wheels. The people running the 7" wide Steel Cop Car Wheels, man those are really really heavy . . . just even picking them up.
Here goes: so on average the steel wheels weigh 20 lbs more per wheel as compared to the lighter aftermarket aluminum wheels. Times 4 that is 80 lbs of rotating mass that you have to spin up every time you take off and then for braking you have to slow it back down again.
So this is like having an 80 lb flywheel that you have to spin up and slow down every time you start and stop with the steel wheels. Swapped to the aluminum wheels on one of my cars, noticeable improvement. Making better use of the power you are already making, kind of like fully releasing the emergency brakes that are slightly dragging. Lighten up the load, and it goes to beat heck, better gas mileage too.
Have Fun with your 383 A Body . . .
You have 230 at the wheels ? you know it might be more. There are cars right here on Fabo that claim 400/500 at the wheels and only run 115 in the 1/4. lolI would be happy with 320 at the wheels too. But it’s only 230 at the wheels.