Gosh.....sounds like my days of keeping our 250cc two stroke alive!
Sent from my iPhone
> On Nov 30, 2014, at 9:40 PM, "Rick Parent" <rick.parent@att.net> wrote:
>
> It's not stretched head studs. Your engine is most likely on the edge
concerning your jetting. I believe your deduction on the Fall event having
better air because of the cooler weather is correct. We had a crazy year
concerning weather changes. I always jet a little fat and we had trouble at 2
events this year, we didn't lose any motors but quite a few others did. I have
an air density gauge and a weather station, they both do the same thing and
are mandatory for keeping our engines safe.
>
>
>
> On Sunday, November 30, 2014 6:38 PM, Allen Washatko <awashatko@wi.rr.com>
wrote:
>
>
>
> FoT,
>
> Does anyone have experience with head studs stretching? My ARP head
> studs were installed in 2002 and run in race events for seven years. I
> didn't race from 2009 - 2014. During that time, I did a frame-off
> restoration on the TR6. My first event out was the Hawk at Road
> America this year. After the first few practice runs, I blew a head
> gasket. We replaced it and went on to place in class. We did find that
> we were running too much timing and dialed it back.
>
> The next outing was the VSCDA fall event at Road America. It was
> extremely cold (high of 50). We quickly blew another head gasket! This
> gasket was an upgrade to the stock head gasket I had been running for
> years. We replaced it at the track and the same thing happened again.
> The car is running 12.8:1 compression, triple Weber's and full race
> cam. Studs always torqued using ARP assembly lubricant to ARP
> recommended torque rating using their three step approach. Torque
> wrench has been calibrated. The failed gasket has been deteriorating
> at the bridge between cylinders. Location varies. We checked the
> flatness of the head and it is perfectly flat.
>
> Because it was so much colder at the VSCDA fall event, were we
> producing more power due to temperatures which caused the multiple
> failures unlike the Hawk where we were able to finish with much warmer
> temperatures? Could stretched studs be the cause of this somewhat
> erratic behavior?
>
> Thoughts?
>
> Allen
>
> Allen & Jody Washatko
> 1971 TR6 - Number 6
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/rick.parent@att.net
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/jhasty@mhc-law.com
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
|