Changed pushrod length now a miss fire?
Changed pushrod length now a miss fire? I currently have the TEA trick flow heads milled to 60cc with aftermarket cam using the morrell lifters.
I had the comp cams 7.4 length pushrod but always had the sewing machine sound so is switched to 7.425 rods, the sound reduced but after a short drive I'am getting a random or multiple missfire code.
I did the swap myself, I unbolted the yella terra rocker arms one intake one exhaust at a time since they are shaft connected took out the pushrods, replaced and bolted the rockers back in doing the same step one cylinder at a time. What the hell did I do wrong?
I had the comp cams 7.4 length pushrod but always had the sewing machine sound so is switched to 7.425 rods, the sound reduced but after a short drive I'am getting a random or multiple missfire code.
I did the swap myself, I unbolted the yella terra rocker arms one intake one exhaust at a time since they are shaft connected took out the pushrods, replaced and bolted the rockers back in doing the same step one cylinder at a time. What the hell did I do wrong?
I've always had the code PO300 random misfire deleted and removed when getting a tune. If you have a cammed car, it will sometimes trigger this code.
Not sure if it's related to your pushrod swap, but you can try clearing the code and see if it comes back. Does it still run the same or does it feel like a misfire? If you have a misfire, there's no mistaking how it feels when driving.
Not sure if it's related to your pushrod swap, but you can try clearing the code and see if it comes back. Does it still run the same or does it feel like a misfire? If you have a misfire, there's no mistaking how it feels when driving.
I don't feel a misfire, I know exactly what you are saying. My dyno guy deleted the misfire back over a year ago when installing the heads and cam ran fine for a year or two, put in a built auto ran good for a couple months with no code switched pushrods and here I'am.
The dyno guy did a swap from some one elses car that had an auto to mine.
The dyno guy did a swap from some one elses car that had an auto to mine.
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Joined: Jul 2011
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With all your mods, it seems you would have needed shorter than 7.400 pushrods to start with - unless the new cam's base circle was more than 0.060" less in radius. And then you increased the pushrod lenght by another 0.025" on top of that ... just wondering what the real lifter pre-laod is now.
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Verdad Gallardo From what I know the trick flow 215 heads require a 7.5 pushrod, If milled to 60cc that that would require a 7.485 if using morrell lifters that =7.435, other than custom made I could not find this so think I played it safe with the 7.425.
Thanks to everyone so far. Please help or correct if I am wrong on anything.
Thanks to everyone so far. Please help or correct if I am wrong on anything.
For what it is worth, I am running Trick Flow 215s milled to 61.5 cc, with Morel lifters, a EPS cam (that required 7.425 push rods in conjunction with stock 243s), and Jesel Sportsman shaft rockers. The push rod length to establish a 0.050" preload on the Morels is 7.367" overall length which equates to 7.350 gauge length.
Last edited by Darkman; Mar 10, 2012 at 05:32 PM.
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From what I know the trick flow 215 heads require a 7.5 pushrod, If milled to 60cc that that would require a 7.485 if using morrell lifters that =7.435, other than custom made I could not find this so think I played it safe with the 7.425.
Thanks to everyone so far. Please help or correct if I am wrong on anything.
Thanks to everyone so far. Please help or correct if I am wrong on anything.
TECH Regular
Joined: Jul 2011
Posts: 452
Likes: 2
I currently have the TEA trick flow heads milled to 60cc with aftermarket cam using the morrell lifters.
I had the comp cams 7.4 length pushrod but always had the sewing machine sound so is switched to 7.425 rods, the sound reduced but after a short drive I'am getting a random or multiple missfire code.
I had the comp cams 7.4 length pushrod but always had the sewing machine sound so is switched to 7.425 rods, the sound reduced but after a short drive I'am getting a random or multiple missfire code.
Setting Hydraulic Lifter Pre-load (Adjustable Valve Train)
"When installing a hydraulic cam, lifters or rocker arms, establishing the correct lifter pre-load improves both performance and engine life. Insufficient pre-load will create excessive valve train noise and wear. Excessive pre-load will cause rough idling and low manifold vacuum, and can even lead to severe engine damage."
