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Topic Review (Newest First)
06-14-2013 08:15 AM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
you need to decide what fuel to run or what is available.
8.5:1 dcr is a starting place for your aim. sooooooooooo,,,,,,,,,,,,,,

figure how many ponies you want/need first
we know its a 383 so now figure what heads you need?,,you have AFR 195s
we know that those heads can support close to 600 hp if we have enough CR/and breathing,with fuel to support the parts.

now you can reverse engineer the engine
how many RPMs are you willing to ring out of the engine,?
what fuel will you be using?
what camshaft will get the RPM and get as much flow out of your AFRs as possible in that RPM range.(this will take some time planning because an engine that revs 7500 rpm has a fairly long duration cam that may not match your application and matching parts)
Like Techinspector says"(paraphrased) the effective RPM band is usually 3500 rpm or LESS"
so that 7500 RPM engine will come alive around 4,000 rpm or higher,,,do you really want that?

If you want an engine that peaks at 6,000 rpm,will that engine make the horse power that you want?what total percentage of the available head flow will you be able to use?We need to run a couplesims with Richard? I would be looking for a tune that has peak power around 6800 rpm with those heads and a solid roller cam.
I know right now I wont agree with Richard,but thats good as you can decide for yourself what package works best for you and your application.
Off the top of my head( g2g2 work),,,I would use around 10.5:1
a cam in the low 240s with .600 ish lift, icl/lda to be determined but start at 108/108,probably advancing ICL,,,,
fuel management flowing 850 cfm with single plane intake(Richard would use an RPM dual plane) 1 3/4 inch primary headers,tube length to be determined?
I would be aiming for 535-540 hp
ttyl
Lets run some sims with Richard...heads will be AFR 210 Eliminators...cam will be 12-772-8...compression (static) will be 9.5:1 for the first sim. I really appreciate your help.
06-14-2013 07:02 AM
CNC BLOCKS NE
Quote:
Originally Posted by 1Gary View Post
The Scat rods with either ARP bolt size works well.




It is important to consider the wt's of these rods for balancing.
Those are not a good rod for a stroker build as you would need a reduced base circle cam, The I beam rod with the 7/16 bolts do not require a reduced base circle cam with a 3.750 stroke.
06-14-2013 06:56 AM
vinniekq2 you need to decide what fuel to run or what is available.
8.5:1 dcr is a starting place for your aim. sooooooooooo,,,,,,,,,,,,,,

figure how many ponies you want/need first
we know its a 383 so now figure what heads you need?,,you have AFR 195s
we know that those heads can support close to 600 hp if we have enough CR/and breathing,with fuel to support the parts.

now you can reverse engineer the engine
how many RPMs are you willing to ring out of the engine,?
what fuel will you be using?
what camshaft will get the RPM and get as much flow out of your AFRs as possible in that RPM range.(this will take some time planning because an engine that revs 7500 rpm has a fairly long duration cam that may not match your application and matching parts)
Like Techinspector says"(paraphrased) the effective RPM band is usually 3500 rpm or LESS"
so that 7500 RPM engine will come alive around 4,000 rpm or higher,,,do you really want that?

If you want an engine that peaks at 6,000 rpm,will that engine make the horse power that you want?what total percentage of the available head flow will you be able to use?We need to run a couplesims with Richard? I would be looking for a tune that has peak power around 6800 rpm with those heads and a solid roller cam.
I know right now I wont agree with Richard,but thats good as you can decide for yourself what package works best for you and your application.
Off the top of my head( g2g2 work),,,I would use around 10.5:1
a cam in the low 240s with .600 ish lift, icl/lda to be determined but start at 108/108,probably advancing ICL,,,,
fuel management flowing 850 cfm with single plane intake(Richard would use an RPM dual plane) 1 3/4 inch primary headers,tube length to be determined?
I would be aiming for 535-540 hp
ttyl
06-14-2013 06:26 AM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
the bigger cam,or w/e cam you decide to use,needs the CR matched. When I use a bigger cam,I usually use bigger matching components(carb/intake/headers)
tune the engine and choose the parts for the situation the engine will be exposed to.Usually to get more HP you need higher rpm or bigger engine.
What conpression ratio would you prefer for the 12-772-8? I was thinkin 9.5-10:1
06-14-2013 06:18 AM
vinniekq2 the bigger cam,or w/e cam you decide to use,needs the CR matched. When I use a bigger cam,I usually use bigger matching components(carb/intake/headers)
tune the engine and choose the parts for the situation the engine will be exposed to.Usually to get more HP you need higher rpm or bigger engine.
06-14-2013 06:10 AM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
comp 12-433-8 or Comp K12-772-8 (Solid Roller)
two different cams?
12-433-8 in the 406 in jeep now and 12-722-8 for the 383 engine build.
06-14-2013 05:55 AM
vinniekq2 comp 12-433-8 or Comp K12-772-8 (Solid Roller)
two different cams?
06-14-2013 04:46 AM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
maybe make a few improvements on the current engine while refreshing it.Take a real good look at everything and save some money not buying all new parts
I don't want else to do to my engine that's already running. It has AFR 195 Eliminators, comp 12-433-8, scat crank, forged probe pistons, scat forged rods. I'm going to be building this 383 regardless. What do you think I should do? What should I do to make more power with the build?
06-13-2013 09:29 PM
vinniekq2
freshen that engine

Quote:
Originally Posted by lhmurphy View Post
Good question lol I want to build an engine myself and have a friend who would pay me to run it in his mud bogging jeep...I guess I just find pride in building something that can run great. Also it has always been on my "bucket list" to build and blueprint my own small block...something about hearing those engines run has gotten me hooked. The fact that "I" know exact clearances and all the nuts and bolts on the engine would give me peace of mind also if I decide to run this thing myself.
maybe make a few improvements on the current engine while refreshing it.Take a real good look at everything and save some money not buying all new parts
06-13-2013 09:22 PM
lhmurphy
Quote:
Originally Posted by S10 Racer View Post
Keep in mind before you order lifters that the Dart SHP requires .100 taller lifters and that the lifter bores need honed.
I went with Comp Cams 873-16 mechanical lifters
06-13-2013 09:02 PM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
and Im betting I have over 500 HP right now in my jeep????

why build another engine with the same power?
Good question lol I want to build an engine myself and have a friend who would pay me to run it in his mud bogging jeep...I guess I just find pride in building something that can run great. Also it has always been on my "bucket list" to build and blueprint my own small block...something about hearing those engines run has gotten me hooked. The fact that "I" know exact clearances and all the nuts and bolts on the engine would give me peace of mind also if I decide to run this thing myself.
06-13-2013 08:47 PM
vinniekq2 and Im betting I have over 500 HP right now in my jeep????

why build another engine with the same power?
06-13-2013 08:41 PM
lhmurphy
Quote:
Originally Posted by S10 Racer View Post
Keep in mind before you order lifters that the Dart SHP requires .100 taller lifters and that the lifter bores need honed.
Thanks! And I already have the link bar lifters that can clear in the SHP.
06-13-2013 08:40 PM
lhmurphy
Quote:
Originally Posted by vinniekq2 View Post
Have you considered a smaller engine with less power?High RPMs are not a problem,,,
big horse power engines in an unknown car is a huge problem. A vega or Jeep? seriously? either of these cars will do poorly with stock suspension and 500 hp.
I know all about suspension stuff with jeeps and Im betting I have over 500 HP right now in my jeep. It really hooks good bc my aftermarket leaf springs are pretty stiff and my tires have good tread on them. 500 HP in my jeep won't cause suspension problems I do believe.
06-13-2013 08:32 PM
S10 Racer
Quote:
Originally Posted by lhmurphy View Post
Parts list:

Scat40805BI Includes-(Forged Icon Pistons +19.6cc)
Forged Scat Crankshaft 3.75 Stroke
Forged Scat I beam rods

Block: Dart SHP 4.030 Bore, Zero Decked, Ready to assemble

Cam Kit: Comp K12-772-8 (Solid Roller) @.05 248/256 Lift: .576/.582

Parts Stack Height: 9.000

Compression Ratio: 9.5:1 with 64cc combustion chambers

Head Gasket Thickness: .039

I'm currently looking at bolting on a set of AFR 1054's to top this engine off. My plan for this motor is to use it for mud bogging. My dilemma is that I want to bolt on a set of heads that can really match this cam and make this motor push 550 horsepower to really spin all four of the 35 inch mud tires. Rear end is a 3.73 gear and plans to go to 4.56 are coming soon. Any advice to what set of heads, or cam change would be appreciated. I also want to be able to run no higher fuel than 93 octane but if alcohol is needed to raise HP and torque a reasonable enough amount to justify running it then I'm all for it. Thanks in advance.
Keep in mind before you order lifters that the Dart SHP requires .100 taller lifters and that the lifter bores need honed.
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