project carbed 4th gen

[DeWynter]

Peak HP at 4750 RPM = 382
Peak TQ at 3000 RPM = 498

I sent Screen shots to FastTA he may post them if he wants, they give piles of extra info. Plus there is a graph.
these figures are with best power set, not least amount of knock. It only goes to 5000 RPM as power really drops off after that. But you get the idea, these are also at the crank figures. With a spark curve I can give you a better figure, if any one has one for the type of ignition you have. I didnt get all of the carb specs fully inputed so I will work at it a bit more tomorrow.

[94Z/28]

Well it looks like maybe my guess was a little optimistic. I guess when I get it driveable ill take it and see what the chassis dyno says. I think the limiting factor is the smallish cam, but I appreciate the help guys and if I think of another cam I would rather run maybe I can get another pull.

[DeWynter]

I think the limiting factor may be the heads and cam. The heads dont have overly high flow numbers especialy coming from such a big intake. Your torque is high due to the design of the intake and it has fairly long runners including the head.

[fastTa]

Peak HP at 4750 RPM = 382
Peak TQ at 3000 RPM = 498

I sent Screen shots to FastTA he may post them if he wants, they give piles of extra info. Plus there is a graph.
these figures are with best power set, not least amount of knock. It only goes to 5000 RPM as power really drops off after that. But you get the idea, these are also at the crank figures. With a spark curve I can give you a better figure, if any one has one for the type of ignition you have. I didnt get all of the carb specs fully inputed so I will work at it a bit more tomorrow.

I didn't get them. What software are you using? If you want, just send the screenshots to kgrubbs@satx.rr.com

[fastTa]

Peak HP at 4750 RPM = 382
Peak TQ at 3000 RPM = 498

I sent Screen shots to FastTA he may post them if he wants, they give piles of extra info. Plus there is a graph.
these figures are with best power set, not least amount of knock. It only goes to 5000 RPM as power really drops off after that. But you get the idea, these are also at the crank figures. With a spark curve I can give you a better figure, if any one has one for the type of ignition you have. I didnt get all of the carb specs fully inputed so I will work at it a bit more tomorrow.

Well don't lose hope just yet. Sometimes these dyno sims are close and sometimes they are way off. It really just depends on the motor in real life. I would suspect that you would easily be able to make 400 HP though. If you choose to use that cam, you could always degree it in 4 degrees retarded and that would give you a little more power under the curve, push your peak power a little higher in the RPM's, and make more overall power.

[DeWynter]

Here is the screen shots and graph. This is in Engine Analizer pro V3.3.
Ignor the 383 at the top as I had not saved it yet by that time and it was defaulting to my 383 save name. It is really the 406 SB. Due to the carb being not set completly right It shows poor A/F %. But only at low RPM(rich).

[fastTa]

Here is the screen shots and graph. This is in Engine Analizer pro V3.3.
Ignor the 383 at the top as I had not saved it yet by that time and it was defaulting to my 383 save name. It is really the 406 SB. Due to the carb being not set completly right It shows poor A/F %. But only at low RPM(rich).

Actually I did get your email. I got your name and 94z28's mixed up.

Why are you using a 11.68:1 compression ratio? And also his cam has a 106 ICL and it looks like you have it figured as a 110 which would be installed straight up. That cam is not meant to be installed straight up and could likely be why the HP is low and why it says detonation is likely. This will aslo throw all of the valve event calculations off and also throw off the dynamic compression calculations.

Theoretically a lower center line would show a little more power under the curve, but you never know.

[DeWynter]

Actually I did get your email. I got your name and 94z28's mixed up.

Why are you using a 11.68:1 compression ratio? And also his cam has a 106 ICL and it looks like you have it figured as a 110 which would be installed straight up. That cam is not meant to be installed straight up and could likely be why the HP is low and why it says detonation is likely. This will aslo throw all of the valve event calculations off and also throw off the dynamic compression calculations.

Theoretically a lower center line would show a little more power under the curve, but you never know.

Ill run it again with the changes, I was kinda tired when I did it so may have a few things not perfect. This program has so many settings it takes about 3/4 of an hour to set it up. 11.68:1 is the static comp. its probably a bit lower than that but I dont know the comp height and dish amount of the particular piston he is using so I used a standard flat top 4 valve relief dish amount of 8cc and the specs given on in the hole and a standard felpro gasket height of .041(from their site its a nominal number). The program came up with that amount. Its a pretty good program but takes a few days of tweeking to get it right. I also dont know the runner cc of the exhaust so I had to make an educated guess, based on other heads in the same category. WHen I was done with the program and my first crack at my 383 the program and the actual dyno were only 7% off overall. The best thing is to get actual flow testing of all the parts but not all of that is available on the net. Mostly the flow coeficent is really needed, but A guy can make a pretty good educated guess based on othe parts that are similar.

[Kevin - Blown 95 TA]

He has a pole barn with a lift. I hate him.

[TraceZ]

He has a pole barn with a lift. I hate him.

If I had a setup like that I'd be powerwashing and detailing the bottom of my car too.

My wife would divorce me for sure.

[94Z/28]

The lift is great, I got it at the begining of this project. It makes working on your car way easier and more enjoyable. The good thing is they are not as expensive as most people think, got it for like $1500+freight. All you need to put it in is a half day, a couple friends, a hammer drill, some basic tools, and some wire.

[fastTa]

He has a pole barn with a lift. I hate him.

Great for those afterhours drinking binges on Friday nights!

[Joe 1320]

Well don't lose hope just yet. Sometimes these dyno sims are close and sometimes they are way off. It really just depends on the motor in real life. I would suspect that you would easily be able to make 400 HP though. If you choose to use that cam, you could always degree it in 4 degrees retarded and that would give you a little more power under the curve, push your peak power a little higher in the RPM's, and make more overall power.

Yup! as long as the heads will flow, this will work.