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Re: Engine Troubles

To: Thomas James Pokrefke <>
Subject: Re: Engine Troubles
From: "Eric L. Van Iderstine" <elv1@Ra.MsState.Edu>
Date: Sun, 8 Dec 1996 14:51:37 -0600 (CST)
What are you tuning it with?? 

I got reasonable results from the SU tuning kit (attaches to carb piston,
rising with increased balance airflow), but have since switched
to using a uni-syn and a colortune kit......and as soon as I get the
chance I'll probably put an O2 sensor in the exhaust stream for a A/F
ratio meter (overkill, but I just happen to have one).

If you ever make a trip to Memphis from Hattiesburg, stop by and you can
use my stuff.....or send me your address and I'll send you the SU tuning
kit.  If that doesn't work, let me know, my parents still live in
Hattiesburg, and I could be talked into sending the colortune and uni-syn
to them and you using it there


Eric L. Van Iderstine   -   elv1@Ra.MsState.Edu   -
Machine Development Engineer
HMC Technologies, New Albany, MS
74 MGB
96 Formula SAE

On Sat, 7 Dec 1996, Thomas James Pokrefke wrote:

> I have been having trouble with my engine lately.  In the low to mid rpm 
> ranges, when I am acclerating, the engine is not 'right'.  The engine 
> runs rough, and then after about 3600 rpm, clears up and storms right up 
> to redline.  I think that the carbs are either flooding ath the low rpms, 
> or the timing is not right.  I checked the timing last night, and it was 
> dead-on.
> Does anyone have an alternative method of checking the mixture settings 
> on the HS-4's?  My 'lift the pin a 1/16" and listen to the increase in 
> engine speed method" seems to have failed me.  All suggestions 
> appreciated, except putting on a Weber.
> Thanks in advance,
> Thomas James Pokrefke, III (I run fine at all rpms)
> 1970 MGB (runs rough in the low- and mid-ranges)
> (runs rough in the upper-range {ie-500+msg})

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