Does anyone experience roughness of idle when starting your blown car during cold days????

I am now getting blower vibration for about 5 seconds during a cold weather start up.

Thanks!

 

this will help

https://www.thirdgen.org/techbb2/sho...hreadid=166571

 

B4Ctom1,

You are the ONLY one to have an explanation for this.

Guess it is just some foul in the tuning being amplified at the initial start up.

If you read a past thread, I had to actually change the smaller blower pulley because of this problem.

I am running my original 12 # pulley and the problem only occurs for about 5 seconds from start up.

With the 15 # pulley the chung, popping would go on for minutes???? Had to remove it.

Weird problem.

Otherwise the car runs fine.

Thanks.

 

My explanation is not 100% I am not there, I cant hear it, and I can't see it. But it is a common symptom/problem (cold and noisy). I have seen on vortech's, ATI's and even some roots cars. It always seems to be at startup or when the engine is cold.

I have told a few stang owners that have encountered this to pull a plug and check it for fouling, or replace the plug wires/tune up and it fixes it sometimes as well.

This has been addressed a couple times now actually (I couldnt find some of the old posts). But, '83 Crossfire TA' gave us some very straightforward and technical reasons as to why misfires occur on cold motors (he is good at stuff like that) I first encountered the problem on some cars I had finished supercharger installs on.

 

So when you say "cold" do you mean on cold winter days?

When the weather is warn I have NO problems.

Interesting, I ran my Datamaster program on the car and see nothing unusual????

 

well, there is something else. the gears "crush" the oil as it runs through them. when it is cold its much thicker and kind of "pressurizes" as it is mashed between the gears. that increase and decrease of clearance may be what is helping to make the "chugs" and "pauses" in the normally steady noise of the blower gears.

I have something to compare this to, on cars with external fuel pumps you will hear either more noise or chugging of the fuel pump when running race gas compared to pump gas. I was told this is due to the Shearing forces of the pump rotor "tearing" at the fuel and the differentces of how hard or easy eachfuel is "torn" based on its (specific gravity?) properties.

 

Thanks for the insights.

I just wonder why I seem to be one of the few posting this problem.

I am in Louisiana and we do not have much cold weather here.

I would figure that the northern members would have more problems with this???

Perhaps there are not too many blown cars running in the foul winter months?

Thanks again. This is not a big problem, no damage. But I am just trying to understand it.