bent push rod, need new cam - what's best to do
10-21-2002, 04:12 PM
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bent push rod, need new cam - what's best to do specs: 99 SS Camaro, upgraded computer program with better power curve and bumped rev limiter to 6200. stock engine.
Problem: engine has always had a bobble/misfire around 5000-5200 rpm. Cant figure that one out. Just recently I bent a push rod when the trans didnt want to upshift from 2 to 3 (auto) and engine sat at 6200 for about 2-3 seconds. I replaced the pushrod but the lifter looks in bad shape.
Where do I go from here? I have an underdrive pulley set up, good air box, no screen in MAS, staight out exhaust after cats (loud mouth). I would like more HP but since I have to change the cam to be on the safe side, do I do heads? will bottom end hold up to hotter cam? will trans hold up to more HP? etc. Whats a safe bet for targeting 400 wheel HP? Any thought are greatly appreciated.
Problem: engine has always had a bobble/misfire around 5000-5200 rpm. Cant figure that one out. Just recently I bent a push rod when the trans didnt want to upshift from 2 to 3 (auto) and engine sat at 6200 for about 2-3 seconds. I replaced the pushrod but the lifter looks in bad shape.
Where do I go from here? I have an underdrive pulley set up, good air box, no screen in MAS, staight out exhaust after cats (loud mouth). I would like more HP but since I have to change the cam to be on the safe side, do I do heads? will bottom end hold up to hotter cam? will trans hold up to more HP? etc. Whats a safe bet for targeting 400 wheel HP? Any thought are greatly appreciated.
10-21-2002, 07:22 PM
#2
Re: bent push rod, need new cam - what's best to do Have you upgraded the stock springs yet. If you are reving that thing sustained at 6000+ rpm with the stock springs you can basically kiss anything that put on the upper end goodbye within 5k.
The stock springs do not hold up well to high rpm. If you are going to be getting a cam, change the spring to Comp Cams 918's first. This will alleviate alot of your valvetrain problems.
The bottom end will hold up just fine with the new cam. The tranny will hold up fine as well. I am smacking mine with nearly 500 hp (on the juice) and it is still kickin.
Ensure that you check all of your valvetrain geometry carefully before using your cam. Ensure that your pushrods are the correct length.
If you are unsure as to which cam to use, do a search in this section for "which cam". You will have enough reading to last a week.
Good Luck,
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
The stock springs do not hold up well to high rpm. If you are going to be getting a cam, change the spring to Comp Cams 918's first. This will alleviate alot of your valvetrain problems.
The bottom end will hold up just fine with the new cam. The tranny will hold up fine as well. I am smacking mine with nearly 500 hp (on the juice) and it is still kickin.
Ensure that you check all of your valvetrain geometry carefully before using your cam. Ensure that your pushrods are the correct length.
If you are unsure as to which cam to use, do a search in this section for "which cam". You will have enough reading to last a week.
Good Luck,
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
