dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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having uprated cams on standard pistons?
asked for a quote from Vsport (very quick and helpful) but its come to a large price. I asked for a quote including forged pistons - but ive been given a quote with 87.5mil pistons meaning it would nearly be a 2.1!
Can't you get forged pistons in 86mil? (Meaning i dont need a rebore and more cost ) because i thought you could
cheers
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Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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depends what spec the cams are.
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breezy-1.4
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Registered: 9th Jun 07
Location: Wolver-tramp-ton
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quote: Originally posted by Adam_B
depends what spec the cams are.
^^ agreed.as far as i know. i wouldnt risk it tho
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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Standard pistons with bigger valve pockets is the way to do it, but forged pistons = higher compression ratio, which means more power
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Deano_sxi
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Registered: 10th Apr 05
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ask dave
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JM_16v
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Registered: 17th Oct 05
Location: Essex Drives: GLC63S
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Dave A is Vsport
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davey_jack
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Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
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quote: Originally posted by Robin
but forged pistons = higher compression ratio, which means more power
Does it? I always thought the point in buying forged pistons was you could choose the size and compression ratio you wanted?
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Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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early xe's have forged piston's as standard iirc...
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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quote: Originally posted by davey_jack
quote: Originally posted by Robin
but forged pistons = higher compression ratio, which means more power
Does it? I always thought the point in buying forged pistons was you could choose the size and compression ratio you wanted?
Forged pistons for an XE will have a higher CR, whatever you buy.
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davey_jack
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Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
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Oh right, yeah forged pistons for an XE will only be available with high compression! Just confused me, I thought you meant all forged pistons increased the compression ratio of any engine!
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Deano_sxi
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Registered: 10th Apr 05
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quote: Originally posted by JM_16v
Dave A is Vsport
well durrrrrrrrrrrrrr
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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the main reason for forged pistons isnt just the increase in bore size (they are available smaller than the size I quoted you) but the main advantage is reliablity and the raised compression ratio.
if you want to keep your standard pistons, thats fine as we can machine larger pockets to accept the bigger cams, however machining bigger pockets in standard cams actually lowers compression ratio so it can take away some of the advantage of fitting the bigger cams.
or a better idea is to let us design a cam that will go well with the standard pistions, keeping a decent duation but with less lift. best of both worlds then
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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well after sending many emails i think we've come to an agreement
my limit as said was 2k so i dont think i could get forged pistons as well as cams for that or under.
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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£500 for pistons, £300 for cams, that leaves £1200 for fitting and whatever else you need. You can do it, definitely.
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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well im getting a balanced bottom end too. i'll post up my price list (im sure dave wont mind) from Vsport to show you
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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New piston rings £100.00
Cams £ 330.00
Timing belt kit £ 68.00
Cam seals £ 16.00
Competition slim stem oil seals £ 26.00
Uprated hydraulic cam lifters £ 120.00
Big end bearings £ 40.00
Con rod bearings £ 38.00
Crank seals £ 18.00
Sump gasket £ 11.00
Head bolts £ 14.00
Head gasket £ 38.00
Inlet gasket £ 4.00
Exhaust gasket £ 6.00
Rocker cover gasket £ 18.00
Double valve springs £ 123.00
Crank/fly balance and polish £ 180.00
Block rebore and hone £ 160.00
Head skim £ 25.00
Chemical clean £ 40.00
Labour to complete above work: £ 400.00
Cleaning materials £ 20.00
Nett total £ 1775.00
Vat £ 310.63
Total £ 2085.63
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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My engine rebuild is going to cost me more than I thought then
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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lol. the list i wanted including conrods and forged pistons would of cost me like 3200.
i was ratherly shocked. so now im down to that
will probs just save and get forged pistons march next year.
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TheCam
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Registered: 16th Mar 07
Location: Kirkcaldy
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what is the advantage of a balanced bottom end?
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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revs better, runs smoother, can rev higher without shaking itself apart, it's just better really
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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indeed
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Stu
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Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
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Whats the spec of your engine at the moment Dan?
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dan_c4rsa
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Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
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a very tired standard xe with powercap, and the usual bolt on's.
Crank Casing is starting to go and theres a sticky valve or lazy tappet somewhere im thinking. So instead of just getting another valver, i though fook it get it rebuilt and i can just keep building on it.
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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machining the standard pistons doesn't necessarily mea you will ower the compression chamber as you would cc the engine and then make up for the loss by skimming the head.
i ran machined standard pistons in a x16xe and ran a 12.5:1 compression ratio for example
good prices for the work non-the-less
[Edited on 17-10-2007 by broster]
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