Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Weird issue that I can't find a word for, does anyone know what this is?
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Old 11-19-2012, 09:40 AM
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Originally Posted by Zerocyde View Post
In case it matters: Basically stock, brand new 355 sbc with nice aluminium heads, 650 holley DP, and the smallest thumpr cam. T-5 Manual, and terrible (like 2.43 or something) highway rear end ratio. (will be 4.11 in 2 months)

I know I have a bit of the car shaking back and forth when cruising in the wrong rpms, and I'm pretty sure that has to do with the rear end ratio, but this other issue seems different.

Basically, when cruising down the street, if I give light throttle and I'm under 2k rpm, I will get quick little jumps or hiccups. It kinda feels like quick little clutch slips, but they are quick . Or, maybe, tiny little bursts of power. They happen until the rpms get above 2kish, and feel like they come in a random pattern.

It's quite audible, and you can feel it jolt you. It just sounds like tiny tiny quick little pops of rpm jumps. I tried simulating it by taping my clutch pedal, but I couldn't move my foot quick enough.
There can be causes that range from how the engine is fueling to ignition, to the clutch is banging the limits on the hub springs. Given the gear ratio at 2000 RPM and opening the throttle, the engine wants you to downshift the T5 to get the RPMs up. This should settle what ever the true issue is by just getting out of the range where it happens.

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