Post #1
Hey guys, does anyone know of anywhere I could get hold of 86.5mm pistons for the rallye. Have been told by both pug and my engineering company that they cant get hold of any? Cheers.
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displaying posts 1 to 23 of 23
| Author | Subject: Overbore Pistons |
 bruce2007
Newbie  Location: Manchester/Derbyshire Registered: 21 Jul 2010 Posts: 31 Status: Offline |
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 Posted 29th May 2013 at 12:34
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #2
you either need to source a block with less wear or stump up £600 odd for aftermarket pistons, there are cheaper but personally I would not use them given the feedback I have read from respected and proven engine builders.your dealer was probably lying by the way, 1st oversize is no longer available but second oversize is still listed, 0628 G8, £557. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 29th May 2013 at 12:40
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eliotrw
Seasoned Pro  Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #3
HIgh comp, Low comp?________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 29th May 2013 at 12:41
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #4
Welshpug is correct, if you are looking at standard items I would be tempted to buy another engine with less wear. It will be a lot cheaper than a new set of pistons.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 29th May 2013 at 13:02
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bruce2007
Newbie Location: Manchester/Derbyshire Registered: 21 Jul 2010 Posts: 31 Status: Offline |
Post #5
Cheers guys. Having looked on ebay theres forged pistons available at a lower comp rate.. How much power loss would this make to a standard engine remembering i'd be interested in low boost charging it in the future but I cant afford it atm. Are these pistons just for high boosted cars? IIRC you can run low boost on standard internals?Also my engine rebuilders have suggested sleeving the bore as an alternative and claim its something they do on a regular basis on fast road and track cars, does anyone have any experience of this and tell me if its a bright idea or not? |
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Posted 30th May 2013 at 09:54
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #6
Dont put them in a Standard car!!!And They are no good for low boost either. Basically only any good if you are going high boost or turbo ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 30th May 2013 at 09:57
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bruce2007
Newbie Location: Manchester/Derbyshire Registered: 21 Jul 2010 Posts: 31 Status: Offline |
Post #7
Ah right. Just wondered if they were good for low boost and using them briefly in between! Nevermind! |
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Posted 30th May 2013 at 10:03
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #8
I got a second hand low mileage block which was like new for about £60..... Don't waste your money unless your planning on building a high comp engine for cams and bodddies or low comp for high boost or turbo.________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 30th May 2013 at 10:31
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #9
I would steer clear of the cheaper aftermarket pistons, there is no reason why you couldnt use some aftermarket pistons in a standard engine.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 30th May 2013 at 11:24
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #10
welshpug! wrote: I would steer clear of the cheaper aftermarket pistons, there is no reason why you couldnt use some aftermarket pistons in a standard engine. He's on about putting 8:1 pistons in a standard engine "just incase he went low boost" though. ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 30th May 2013 at 11:26
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armzsc6
Seasoned Pro Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #11
If you did that it would be gutless if it ran and probably wouldn't combust all the petrol properly due to low compression and not being mapped for it. ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 30th May 2013 at 15:38
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #12
I once ran a high boost engine on a low boost map whilst I was running the new high boost engine in prior to having it mapped. It went very well actually, just didn't have the grunt at the top end.  Different story once it was mapped though.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 30th May 2013 at 15:51
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superchargedblack1997gti6
Seasoned Pro  Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #13
there not the right compression for high boost either only for superhighboost! it is possible though i believe that Lynx have done a similar thing before whilst someone got the bits together for the supercharger!________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 30th May 2013 at 16:13
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #14
Yes, I also ran in my Super High boost engine using a high boost kit and map, it didn't work out too bad, although with that you are only dropping from 9:1 to 8:1, so it's not such a huge drop as 10.8:1 to 8:1! ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 30th May 2013 at 17:10
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #15
Just how much does your C/R ratio increase from a head skim?I know its a bit how long is a piece of string but i wonder what the range is? Are we talking 10.81 or 10.89 etc? ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 30th May 2013 at 17:22
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #16
Minimal, it's more of a concern with valve clearance than what affects the CR on these engines when they're skimmed. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 30th May 2013 at 17:56
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swiftyboi006
Seasoned Pro  Location: Maidenhead Registered: 12 Apr 2010 Posts: 2,110 Status: Offline |
Post #17
You could build it with lower comp pistons but it would be gutless almost like running on 3 cylinders. If your thinking of high boosting and not going to do alot of mileage untill then, then yeah id say go for it. But if your low boosting then just go standard________________________________________ cherry p1.....SOLD (regreting this)blaze p2.....why did i buy this SOLD Black p3 |
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Posted 31st May 2013 at 20:48
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #18
Yeah what he said.Or get some 9.5:1 pistons made and make your own "mid boost" 315hp or so jobby ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 31st May 2013 at 21:01
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superchargedblack1997gti6
Seasoned Pro Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #19
Just put a second hand engine in job done for £500 less than the cost of some pistons!________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 1st Jun 2013 at 11:22
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #20
superchargedblack1997gti6 wrote: Just put a second hand engine in job done for £500 less than the cost of some pistons! This is the most financially economic route I must agree. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 1st Jun 2013 at 12:40
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swiftyboi006
Seasoned Pro Location: Maidenhead Registered: 12 Apr 2010 Posts: 2,110 Status: Offline |
Post #21
stan_306gti6 wrote: you dont know what that means stansuperchargedblack1997gti6 wrote: Just put a second hand engine in job done for £500 less than the cost of some pistons! This is the most financially economic route I must agree. ________________________________________ cherry p1.....SOLD (regreting this)blaze p2.....why did i buy this SOLD Black p3 |
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Posted 2nd Jun 2013 at 09:00
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superchargedblack1997gti6
Seasoned Pro Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #22
I think after Stans experience he definitley knows what it means.  ________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 2nd Jun 2013 at 09:49
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #23
superchargedblack1997gti6 wrote: I think after Stans experience he definitley knows what it means. Yeah, I guess so... ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 2nd Jun 2013 at 13:09
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