The Triumph Dolomite Club - Discussion Forum

Posted: **Sun Jan 28, 2007 11:51 pm**

Had a good battle with a red topped Ascona last year...

http://www.youtube.com/watch?v=XeCSPOi8n4Y

Posted: **Mon Jan 29, 2007 5:10 pm**

Looking pretty smokey there but you made him work for it. Was it a modern twin cam red top engine he was running then?

Tinweevil

Posted: **Mon Jan 29, 2007 5:44 pm**

Actually, he caught me napping, coming up behind some slower cars, but I stayed with him for the rest of the session. I don't know if it was a modern red top or not (what's the difference?). Specked you got that from the CT forum.

This was the reason for it smoking so much. I'm not sure if I did any more sessions after that one but I still had a 40+ mile journey back home & it seemed fine.

Posted: **Mon Jan 29, 2007 5:58 pm**

Ah yes, seen the CT thread now. Twin cam 16v red top I think means it must be a C20XE series which at 18 years old maximum feels modern to me. Sprint engine is what, 25 years old minimum. Bloody impressive that you kept him at bay for so long and with a rather sick engine too. I suppose Asconas could be massively heavy?

Tinweevil

Posted: **Mon Jan 29, 2007 7:46 pm**

what was the cause of the piston failure ?

Posted: **Mon Jan 29, 2007 9:13 pm**

gtevo on the other site recon's it's detontion???

you might want to read a couple of the threads on there daz in the tr7 section , he on about building an out an out race engine and has got some great idea's , one of which is bigger valves some thing you were on about a while ago.

rich

Posted: **Mon Jan 29, 2007 9:15 pm**

Didn't think there was much potential for bigger valves in the Sprint head? - you can do a lot of work to the surrounding metal to improve things though...

Posted: **Mon Jan 29, 2007 11:32 pm**

Nice video, what circuit is it?
Slichtly biger valves is an option, we use BMW (bike) valves 6mm pin and very light.
looking at this piston it could be detonation, but hard to tell without seeing the crown, it could also be just an tired piston what was giving in.
I think a lot of luck, it could chatter total also.

Posted: **Mon Jan 29, 2007 11:58 pm**

Hans, yes, I think I was quite lucky as it didn't even score the cylinder. When I took the piston out the bits fell off. I'll take a photo of the crown of the piston & post it on here as I don't know what caused it.

Yes it was Quarry Corner at Castle Combe in Wiltshire.

Posted: **Tue Jan 30, 2007 9:04 pm**

Pic as promised. The damage was just below the valve reliefs.

Posted: **Wed Jan 31, 2007 6:09 pm**

It does look like det bit tooo lean on that cyl
Its not massivley lean though you may have saved it if you had put some octain booster in.

Posted: **Wed Jan 31, 2007 6:10 pm**

rich wrote:gtevo on the other site recon's it's detontion???

you might want to read a couple of the threads on there daz in the tr7 section , he on about building an out an out race engine and has got some great idea's , one of which is bigger valves some thing you were on about a while ago.

rich

What other site ?

Posted: **Wed Jan 31, 2007 10:22 pm**

this one daz, he, wrote stuff in thr 7 section and the dolly section to i think.

rich

http://club.triumph.org.uk/forum/

The Triumph Dolomite Club - Discussion Forum

Video of CC track day 2006

Video of CC track day 2006