Hey there Guest! If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
Hey there Guest - be sure to keep your profile page up to date with interesting info about yourself: learn more
What the heck is that "Resources" tab up there all about? Learn more
More tips and tricks on Posting and Replying: click
Everything you've ever wanted to know about bookmarks, but were afraid to ask: Learn More
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the smilie in place of the real @
Want to mention another member in a post & get their attention? WATCH THIS
So, you created a "Group" here at BCF and would like to invite other members to join? Watch this!
Hey Guest - A post a day keeps Basil from visiting you in the small hours and putting a bat up your nightdress!
Hey Guest - do you know of an upcoming British car event? Pretty Please - add it to our Events forum(s) and add to the calendar! >> Here's How <<
Hey Guest - you be stylin' Change the look and feel of the forum to fit your taste. Check it out
If you run across an inappropriate post, for example a post that breaks our rules or looks like it might be spam, you can report the post to the moderators: Learn More
I have the new block at the machine shop. He will be doing the .030 bore, He needs the clearance from the cylinder wall to the piston. I can't find it in the books, or I don't understand what I am reading. It is a 1973 TR6 block.
That depends on type of piston (cast or forged) and use of engine (street, turbo or race). I'm surprised he asked you for that as he should be able to figure that out on his own or have enough experience to know offhand. The best thing you can do is contact the supplier you got them from and ask their tech dept.
For a non racing engine, .005 is a good number. Remember, measure below the rings, the ring grove area usually sets back a tad more than the skirt. For a racing engine, more clearance is needed. PJ
Triumph Competition prep manual says .004-.005 but doesn't state what type of piston (and this for an engine to see race duty). Type of piston is key; hypers and cast are tighter than forged, call your supplier! https://www.triumph-tr6.co.uk/docs/competitiontr6preparationmanual.pdf
I agree with kellysguy, I was surprised he asked you about the clearance. My machine shop always told me how much the engine needed bored. They did ask me how I was going to drive the car and what my options were for increasing the power.
A friendly reminder - be careful what links you click on here. If a link is posted by someone you don't know, or the URL looks fishy, DON'T CLICK. Spammers sometimes post links that lead to sites that can infect your computer, so be mindful what you click.
(Click X in the upper-right to dismiss this notice)
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.