I'd guess sticking valve in the valve guide for intermittent
compression. At least, that's what happened to
me last weekend.
(Did I post an account of the season finale? My memory is the second
thing to go...)
JZ
> -----Original Message-----
> From: Joerger [SMTP:joerger@open.org]
> Sent: Saturday, September 05, 1998 5:23 AM
> To: spridgets@autox.team.net
> Subject: Bad day at PIR
>
> Track day at Portland International Raceway! The ol' 1275 is feeling
> strong, and pulling 5500 revs at the end of the front straight.
> Temperature 190. Running good! Four laps later, pulling 5200 revs at
> 210 degrees. Hmmmm. Lap and a half later, will only pull 4400 revs
> on back straight, temp jumps to 230, drops a cylinder. Hand up, pull
> off into pits, engine quits.
>
> All plugs look great, good spark everywhere. All valves are free, and
> timing chain hasn't jumped. Restarts with difficulty. Oil pressure
> 55 at idle, 70 at 2000 revs. Pull plug wires off one-by-one: number
> three does not worsten when removed -- in fact, the idle sounds BETTER
> with #3 plug wire off! There is an ugly knock when #3 _is_ fireing.
>
> I'm thinking I broke the piston skirt in #3. With the plug out,
> compression (via the "thumb over the plug hole" technique) is
> intermittant -- sometimes it's there and sometimes it's not. Maybe a
> broken compression ring? Any other thoughts??
>
> I left it at the track, and will push it over to the All British Field
> Meet in the parking lot tomorrow. Stop by and offer sympathy and/or
> ideas.
>
> Mark Joerger
> Westfield Eleven
> http://www.open.org/joerger/
|