Jump to content


Photo

Engine Boring


  • Please log in to reply
2 replies to this topic

#1 USA-PI

USA-PI
  • Registered User
  • 30 posts
  • Location:los Angeles, California USA
  • Cars Owned::Darnell 73 TR6
    CF 5407 U

Posted 10 June 2018 - 07:27 AM

Hello All,

Doing a engine rebuild, My Girl Friend is a 73 TR6 VIN# CF 5407 UG, Engine CC-30915-HE, Head FU-218227

have questions;

Head

Exhaust Valves,

what should be the actual correct size, RevingTon TR says they should be 32mm, GoodParts sells 1.255, British Parts Northwest 1.258,(will be adding hardened seats, Bronze guides w/valve stem seals), trying to get a CR of 10:1

Using a unit converter, I get 32mm=1.2598425197, I round that off to 1.260 correct?,

And are valve stem seals needed on exhaust valves?

Engine

current bore is .040, unsure of piston Manufacturer, should I rule out .060, ( it is my understanding, that with this particular block, it should not present a problem.

 

GentelMen,

As always,

Any and All,

Advise, Suggestions or Information.

Will be Greatly Appreciated.

 

BTW,

still putting in the plumbing for the PI.

 

William F.Tillman.

Attached File  20180217_131345.jpg   127.82KB   0 downloads

Attached File  20180217_131612.jpg   184.03KB   0 downloads

Attached File  20180217_131631.jpg   174.27KB   0 downloads

Attached File  20180217_131640.jpg   148.33KB   0 downloads

Attached File  20180217_131650.jpg   181.2KB   1 downloads


  • 0

#2 Motorsport Mickey

Motorsport Mickey
  • TR Register Members
  • 3,872 posts
  • Location:Nottinghamshire
  • Cars Owned::Enjoying my cars, TR 4 and Triumph Stag, Caravanning...oh yes,
    Building race engines and developing interesting developments of them, and all engineering achievments,
    Cars owned TR3a, now gone
    TR4 Racer, now sold
    TR7V8 Racer, now sold
    TR4 just entering full rebuild

Posted 10 June 2018 - 08:29 AM

If the current bores are still good ( if you want a performance mod they can go out to plus 5 thou over Pistons (Pistons aren't round) why not hone them and use it with re ringed Pistons to maintain life in the engine ?

Mick Richards
  • 0

#3 Waldi

Waldi
  • TR Register Members
  • 857 posts
  • Location:Hellevoetsluis, Netherlands
  • Cars Owned::AR Spider Duetto, TR6, Moris Minor Traveller, MGB GT, XK140FHC, Healey MK2, TR6-PI (CP, 1970)

Posted 10 June 2018 - 08:40 AM

If the current bores are still good ( if you want a performance mod they can go out to plus 5 thou over Pistons (Pistons aren't round) why not hone them and use it with re ringed Pistons to maintain life in the engine ?

Mick Richards

That is what I did.

Valve guides and seals I bought from Goodparts, good quality, clear fitting instruction, and includes the bush to press the guides in at the correct depth.
Goodparts is in USA, so his parts are a lot cheaper for you.
Same for new push rods, which you will need when you skim the head.
Waldi

Edited by Waldi, 10 June 2018 - 08:41 AM.

  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users