Thread: Newbie needs help!!
Hybrid View
-
12-23-2008 05:26 PM #1
Last edited by pat mccarthy; 12-23-2008 at 05:32 PM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
-
12-23-2008 05:55 PM #2
Car is nothing but a project and a toy. dont really want an rv cam. ill just go buy a set of heads and call it a day. She just gets mad cause i tend to make a 2 day job take 2 weeks and shes tired of it, and worse off she does like to "help" by asking the same question 100 times and get mad and throw stuff when i tell her how to do something.
You guys have told me pretty much what i was thinking. Cam was a freebie and only got $500 into whole car. What heads would you guys match with this setup? Like i said id like to keep the cam or one like it and go from there. Guess im gunna go take the heads off...need a 12 pack first
-
12-23-2008 06:05 PM #3
Tough crowd in here...lol.....I remember when hot rods were all home made.
-
12-23-2008 07:17 PM #4
OK, let's go back to zero and figure this out. To figure static compression ratio, you need 5 figures.
727cc's in the cylinder @ 0.030"-over.
76cc's in the chamber.
9cc's in the deck, figuring the original 0.025" piston deck height and the additional 0.020" from rebuilder pistons. If you used premium pistons with the original compression height same as OEM, the compression height will be 1.560", otherwise cheap rebuilder pistons will be 1.540", resulting in 0.045" piston deck height.
6cc's in the flat top piston eyebrows.
8cc's in the gasket.
Adding these up totals 826cc's drawn in on the intake stroke. As the piston comes to TDC, this volume reduces to 90cc's. Divide 826 by 90 and find 9.2:1 static compression ratio.
The cam to make the motor work properly with this SCR would be in the 260-270 range, not 305. With the 305 cam, the intake valve closes too late to trap the already low volume of mixture and you'll be lucky to make 100 psi cylinder pressure. A 260-270 cam would make 140-160 psi with the 9.2 SCR that you now have.
If you want to use that 305 cam, or one like it, you'll have to rebuild what you have to make a 10.5-12.0 motor out of it to make the cam work right. Also, the 305 cam, even with the proper SCR, will make power from 3500 to 7000. Are you geared for this? Is this a solid lifter cam? 'Cause a juice cam will sign off at about 6200 when the lifters pump up.
Do yourself a huge favor and read this tutorial from Iskenderian....
http://www.iskycams.com/camshaft.phpPLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
-
12-23-2008 07:46 PM #5
Damn Tech, you sure do know your stuff. Im looking to build a nice hp motor. Just never learned how to just setups together. Im new to this and it really interests me, but nobody ever tought me high hp motors. I know a little but not enough and everyone around here can only tell me about hondas ans imports
Well i was dead nuts on, took heads off, push rods are a lil bent and you can see where valves hitting pistons, JUST like i though it was. BUT my buddy who argued with me because he "knows his small blocks" insisted i was running low oil pressure and NO WAY were they hitting. I should done what i though was right and waited to put motor back together but i doubted myself.
Oh and tech its a hydo cam. and my car has a 4.11 posi, turbo 350 with a 3k stall.
Soooo back to step one, need heads, valve train, cam. maybe different pistons. oh well
What do you guys think about stroker motors, my buddy says they are garbage but he also though he knew what he was doing with this. I was thinking of a 12 to 1 .383 im aiming for something thats border line streetable with a nasty sound to it
Also could it be hitting because the degree was off?
-
12-23-2008 08:34 PM #6
stroker motors
With all due respect ..Your buddy is an idiot...A stroker motor requires more torque on the head bolts than his honda makes..You have done a wise thing by coming here for advice...The guys here know their stuff....You cannot just throw a bunch of Hipo stuff together and make it work..Some guy that knows his stuff will blow your doors off with stock stuff that's campatible and correctly adjusted..I remember when hot rods were all home made.
-
12-23-2008 09:12 PM #7
The limit for a streetable motor will be the fuel. What's available at the pump where you live?PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.






LinkBack URL
About LinkBacks
hey tech i like to think i am tough and a hard head but i am not bullet proof
and to think i joined here to find some hot women that i could work on here car .damn what a let down
Reply With Quote
I'm happy to see it back up, sure hope it lasts.
Back online