a cam that raises peak hp to higher rpm 6k+??
10-19-2010, 07:29 PM
#1
2nd Gear Member
Thread Starter
Join Date: May 2008
Posts: 287
a cam that raises peak hp to higher rpm 6k+??
i have a 88gt and a 89gt
im looking for a race cam that will not need notched pistons, will add significant amount of power but at higher rpm . im looking for 50+ hp and its ok if i need stffer valve springs an aftermarket rockers.
mods are basic bolt ons
88gt -, pullys ,o/r h pipe ,flowmasters,65mm throttle body, big con filter.
89gt-same with mac headers , stock throttle body, e fan
im looking for a race cam that will not need notched pistons, will add significant amount of power but at higher rpm . im looking for 50+ hp and its ok if i need stffer valve springs an aftermarket rockers.
mods are basic bolt ons
88gt -, pullys ,o/r h pipe ,flowmasters,65mm throttle body, big con filter.
89gt-same with mac headers , stock throttle body, e fan
10-21-2010, 12:32 AM
#3
2nd Gear Member
Thread Starter
Join Date: May 2008
Posts: 287
few reasons
im looking for heads and am wanting to extend and raise power band seeing as how im not even making power past 5k rpm
http://www.jegs.com:80/i/Edelbrock/3...24#moreDetails
performer rpm heads are looking good so far 1.900 intake/1.600 exhaust valves ,im hoping to not have ptv issues.
i know thers a complete topend package but i might skip the cam and go for the rpm heads and victor inake .
just trying to get input options from all angels trying to get it right 1st time round.
im looking for heads and am wanting to extend and raise power band seeing as how im not even making power past 5k rpm
http://www.jegs.com:80/i/Edelbrock/3...24#moreDetails
performer rpm heads are looking good so far 1.900 intake/1.600 exhaust valves ,im hoping to not have ptv issues.
i know thers a complete topend package but i might skip the cam and go for the rpm heads and victor inake .
just trying to get input options from all angels trying to get it right 1st time round.
10-21-2010, 01:30 AM
#4
5th Gear Member
Join Date: Aug 2007
Location:
Posts: 3,189
well grey already told you the other part to this with the rotating assembly. your rotating assembly needs to be balanced to spin higher than your stock redline, and i don't know what crank the 5.0's use so i can't tell you for sure if its cool or not.
heres the 4.6 world and i'll use the mach1 for a clear example.
automatic mach1 has the same rods, pistons, and crankshaft as the GT's do (cast crank, which is not balanced to spin to 7k). redline for the auto mach1 is 5800rpm just like a GT (and this is a 4v motor and top end is the exact same as manual version, so its not like it cant make power that high).
manual mach1 has the cobra crank, which is balanced. rods and pistons are the same, but redline is 6800. the only difference between these two cars is the transmission and the crankshaft. but the RPM is 1000 higher on the manual.
theres a difference between bieng able to make power over 6k, and having a motor thats capable of turning that high. just because you throw heads and cams on your car that make power up to 9k rpm doesnt mean your motor is going to be happy turning that high.
heres the 4.6 world and i'll use the mach1 for a clear example.
automatic mach1 has the same rods, pistons, and crankshaft as the GT's do (cast crank, which is not balanced to spin to 7k). redline for the auto mach1 is 5800rpm just like a GT (and this is a 4v motor and top end is the exact same as manual version, so its not like it cant make power that high).
manual mach1 has the cobra crank, which is balanced. rods and pistons are the same, but redline is 6800. the only difference between these two cars is the transmission and the crankshaft. but the RPM is 1000 higher on the manual.
theres a difference between bieng able to make power over 6k, and having a motor thats capable of turning that high. just because you throw heads and cams on your car that make power up to 9k rpm doesnt mean your motor is going to be happy turning that high.
Last edited by MU71L4710N; 10-21-2010 at 01:32 AM.
10-21-2010, 08:43 PM
#5
6th Gear Member
Join Date: Apr 2006
Location: Las Vegas
Posts: 5,010
The only problem with that is all off the shelf cams will rev up and make power to 5700 on average if you wana go up to 6000-6200 get an edelbrock victor jr intake those things flow up top like ****ing crazy.
05-01-2012, 06:27 PM
#8
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Join Date: Jun 2010
Location: Pennsylvania
Posts: 347
Pretty sure 88 and 89 have reliefs built into the pistons for valve clearance anyway. Anything over 6k RPM you will definitely want a well balanced rotating assembly. Besides, if you're going to spend that much, just make a 347 out of one of them. You'll at least have the other to drive!
05-03-2012, 01:13 AM
#9
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Join Date: May 2008
Posts: 287
i wan to stroke it and keep the stock sized pistons. all the rotating assembly talk is seeming worthless.
if i upgrade the rotating assembly seems there would still be a great deal of work that would need be done just to get the engine to perform up there.
I am not so concerned with the gain of rpms as i am with the gain of hp .
is there a cam that would give significant power improvement while not needing to rev so high. I'm not looking for a small improvement i am looking to turn up the power closet to 400hp if not more
if i upgrade the rotating assembly seems there would still be a great deal of work that would need be done just to get the engine to perform up there.
I am not so concerned with the gain of rpms as i am with the gain of hp .
is there a cam that would give significant power improvement while not needing to rev so high. I'm not looking for a small improvement i am looking to turn up the power closet to 400hp if not more