c20 let re-build piston question
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Thread: c20 let re-build piston question

  1. #26
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    Well, if it all goes bang I'll let ya know, but I've know anybody to do it yet. (Fingers crossed)lmao lmao

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  3. #27
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    i deffo going for the accralite pistons, 400 a set of 4 with rings and pin and delivery and vat, lol. aquamist will be fitted once the engine is ran in, which wont be for a while as i cant get the pistons till about january when they finished making them, lol.

    as far as im aware the head hasnt been skimmed, but it was all done by everyones favs regal, so ill get it checked by a machining shop first.

    how much are the kevlar head gaskets?

    any other parts anyone reccomends for the re-build? all new water pump, oil pump, all bearings etc all gojng in the bottom end. the oil seals on the turbo were fine so im leaving that till it dies. new valve stem oil seals going in. was thinking about head work, but not sure exactly how much difference it would make.

    cavalier turbo, who did your flywheel? as i noticed these were one meaty item when removing, lol

    ah, lastly, whats this ive been hearing about different width bearings or something? jimbo was on about it but i cant remember exactly what he said.

    thanks rds, cavalier turbo 16v astra, apreciated as im knew to turbo's
    dont believe the hype

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  4. #28
    RDS
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    Barnes can you pm me the details of who supplied the pistons rings etc for 400 quid! thats an excellent price!
    As for running 18 psi and only getting 287bhp seems a little adrift, you should be knocking on 315+bhp with 18psi!

    Ps i assume that includes VAT??
    Sir, please step away from the car

  5. #29
    RDS
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    Best bearings to buy for big/small ends are GM ones, the guy at Swindon race engines recommended that
    Sir, please step away from the car

  6. #30
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    cavalier turbo, where did you get the flywheel done at????

    ive been quoted redicoulius prices to have it done.




    finally, is the GM clutch up to the job of 330bhp?
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  7. #31
    RDS
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    Not really no, to the question above!
    Sir, please step away from the car

  8. #32
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    what kinda clutch is gonna hold the strain? one from wallace?
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  9. #33
    RDS
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    Yes thats a good clutch but if you get the Wallace one make sure you have the flywheel machined so the cover plate sinks into the pot more. I beleive this helps clamping pressure. Speak to Regal about this
    Sir, please step away from the car

  10. #34
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    regal eh, lol. nahhhhh.

    ill ring wallace performance and see what they say about clutches and flywheels.

    also might hav just got myself a lightenend and balanced crank, and some shot peened and lightened and balanced rods, sweet
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  11. #35
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    Barnes, I had my flywheel from courtenay and yes it did cost a fortune, but the difference was very noticeable. Better pick up, smoother power delivery and much less engine drag. I had mine lightened by 54%. After speaking with a couple of engineering companys they have told me they could do it for about 70. Get out ya yellow pages and see what engineering places are near you. Tell them how much you want off your flyweel and they will balance it up for ya.

    The GM clutch is crap for anything over 250bhp and spins very easy. My mate has a 290bhp turbo calibra and he has a wallace clutch and it's bloody brilliant. No spin at all.

    Gavin Wallace is the main man to talk to. He will advise you on whats best to run. He's tried most of this stuff on his own cav turbo.

  12. #36
    RDS
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    The GM clutch is crap for anything over 250bhp and spins very easy. My mate has a 290bhp turbo calibra and he has a wallace clutch and it's bloody brilliant. No spin at all.
    A NEW GM clutch will take 300bhp no problem it just won't take 4k launchs at santa pod. The guys at Helix rates the std unit very highly as far as OEM clutchs go
    Sir, please step away from the car

  13. #37
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    I'm getting mine to spin in every gear on full boost. If you have you engine all in bits I would recommend a Wallace clutch. I got told the GM clutch would take the power but from experience I have realised it won't.

  14. #38
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    barnes havent u missed out sum vital info that it was actually an XE
    A dog is for life, not just for your mate to abuse with a Dyson.

  15. #39
    RDS
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    Originally posted by RoyBacer.co.uk
    barnes havent u missed out sum vital info that it was actually an XE
    The LET is basically an XE with low comp pistons and a turbo
    Sir, please step away from the car

  16. #40
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    i need to give gav wallace a ring about some bits n bobs anyway so ill ask about the clutch.

    your right though, seen as its all in bits i might aswell get the proper parts for reliability. i seen the lightened flywheel on courtenays web site and im deffo having it done as they weigh about th same as 2 xe ones. will phone round, see how much i can get it done for.

    cheers
    dont believe the hype

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  17. #41
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    The lightened flywheel helped with torque figures. I'm now pushing 280lb of torque as apose to the standard 204lb.

    I got my kevlar head gasket from Regal with the stud kit. SBD do them as well, but they were 20 more. I can't remember how much they were though

  18. #42
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    is the kevlar one the 1.9mm one?

    so my current shopping list is -

    4 accralite forged low comp pistons
    new gm main bearings
    new gm big end bearings
    wallace performance clutch
    metal tensioners
    new water pump
    new oil pump
    kevlar or steel head gasket
    wallace performance clutch

    anything more to be added?

    thingsa like aquamist will be fitted after its ran in
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  19. #43
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    Yes the kevlar one is the 1.9mm one. You only need this one if you have had or are going to have your head skimmed. If neither of the above have been are are going to be done, get the steel one at 1.6mm.

  20. #44
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    ill have the head checked incase it has been skimmed before i buy any head gasketts.

    rebuild wont start till my pistons arrive, on order and either ready before christmas or just after. so hopefully be attackin it the first week in january.

    painted the LET block red, and pressure washed the g/box and sump, lol, so im on the right track, atleast made a start
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  21. #45
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    I cleaned up everything before putting it back and then forgot to do up the top oil hose on the turbo and as soon as I started it it blew oil everywhere. Never mind. It's all nice and clean now though.


  22. #46
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    thats damn smart that. what heat sheild is that?

    have you painted the actuator black?

    guess ill have to check all the oil hoses, lol, dont want that happeneing after spending hours cleaning and painting everything
    dont believe the hype

    wanted - 2 false limbs and a wheelchair

  23. #47
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    The heat sheild was on the car when I got it. I think someone has custom made it.

    The acuator is a Turbo Technics one, although it's going in the spares bin when the garrett one arrives. It just don't hold enough pressure.

  24. #48
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    Originally posted by RDS
    The LET is basically an XE with low comp pistons and a turbo
    and a low noise block lmao
    LEE69

  25. #49
    RDS
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    Barnes if you are going for phase 4 then dont even bother with the Wallace clutch! Ask Gav to get you a Helix paddle clutch, there more expensive but will not slip at all.
    Sir, please step away from the car

  26. #50
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    Originally posted by Barnes
    pressure washed the g/box and sump, lol, so im on the right track, atleast made a start
    my parents are having dish washer fixed after i blew it up washing car parts lmao everything but the block went in...

    my alloys are going in as soon as it's fixed
    LEE69

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