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Old 03-04-2007, 09:06 PM
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HELP ME.. 454 chevy how to,,please!!!

hey guys my name is Heath and I have a stock 454 and a propane system from www.gotpropane.com and a 4 stage dry sump oil system ,, I need the motor to run at any angle even upsidedown and need as much torque of idle as possible. I was thinking of stroking it? with some new H beem rods and putting roller cam,rockers,and lifters , but I don't no how to do it or what to get where to get it from?/?? must be on the cheap!!! what can I do to raise the compression to run only propane? how hi do i need to raise it? this motor is for competitive rockcraling... and it will be solid mount with motor plate front and back ,, someone please help me!!!!!!!!!!!!

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Old 03-04-2007, 10:58 PM
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I think stroking it is a great idea. There's no substitute for cubic inches. If you want strong low end, I'd resist the desire to increase the compression ratio. Reason is, when you raise the static c.r., you have to use a longer cam which then raises the operating range away from where you want to be. Propane will operate just fine at 9.0:1 although I agree that you can run a much higher c.r. than that with propane (about 110 octane). I think I'd be strokin' it to 500+ cubes, building for 9.0:1 and using a short cam for bottom end torque that will pull tree stumps. Call your favorite cam grinder for a recommendation.
Here's a low c.r. 510 kit from Speed-O-Motive:
http://www.speedomotive.com/ps-85-7-...roker-kit.aspx

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Old 03-05-2007, 01:18 AM
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I don't care how good your dry sump system is, you can't run it upside down. The oil system relies on gravity to return the oil to the pan. If its ending up in the valve covers, no amount of oil system modifications will let you run it upside down.
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Old 03-05-2007, 05:13 AM
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I agree with curtis73... Think a better idea would be to install a 90 degree cutout switch to shut the engine off when the truck (assume...?) rolls to 90 degrees or beyond...? Even at that it may starve if for oil unless you use a purged remote for positive oiling...
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Old 03-05-2007, 08:22 AM
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You can raise the compression by using smaller chambered heads or domed pistons. If you can find heads with combustion chambers around 100 cc you will have a little over 9:1 with flattops. Like the guys have said before, give a cam company a call and tell what your doing and they can help.

Propane can go higher on compression if you want but I wouldnt go over 11:1 and then only on a big cammed car motor. Not really what you want for rock crawling.

John
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Old 03-05-2007, 08:23 PM
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we rockcrawlers spend lots of time on our sides

most competitive crawlers use a 6 stage dry sump with scavenges on each valve cover and one at both ends of the pan and one on ether side of the lifter valley .I seen some weird oil systems some guys build them like aircraft engines ? the guys that run stock oil systems go through engines fast.. I don't no a lot about dry sump systems ... can you put lots of scavenges all over to run at any angle?/
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Old 03-05-2007, 08:36 PM
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propane power

some guys are running like 13.1 compression with propane and they have tons of power,I have seen this rig run and its bad ***.. but I don't no how he did it is that compression possible on a 454 I don't no a lot about that thats just what I was told?? He said propane runs best at really hi c.r. ,,about the lo end torque I have 672gear ratio in my axles and 4to1 in my transfercase and the 1st gear in my trany is 7+ ,,, that guy I speak of has about the same gears .. but Im not sure what to do I want to get this motor just right maby a sweet spot between gears, compression, torque,and lots of power??? I need some help,, you guys are smart... thank you for your responses
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Old 03-05-2007, 08:40 PM
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pistons ???

what are the pros.. and cons.. of raising the compression with domed pistons??Is it better to raise the c.r. with machining some of the head down,or with pistons or with both??
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Old 03-06-2007, 08:23 AM
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If you want anything over 9.5:1 you have to go with domed pistons.
Even though propane has high octane it will still detonate. With that high of compression the cam has to be pretty big to bleed off cylinder pressure (like tech inspector said). Those big cams tend not to idle as well as the smaller ones do. They also kill the low end torque, because they are more for higher rpms. I have been told that 11:1 is the magic number for propane. (By one of David Vizards buddies) If you build a stroker engine with this compression and get a cam company, like schneider , to grind you a custom cam, you will have plenty of power. Just make sure you give them all the info on your setup and what you want from it.

John
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