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dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

15th Oct 07 at 22:23

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

Adam_B

Member

Registered: 13th Dec 00
Location: Lancashire
User status: Offline

15th Oct 07 at 22:42

depends what spec the cams are.

breezy-1.4

Member

Registered: 9th Jun 07
Location: Wolver-tramp-ton
User status: Offline

15th Oct 07 at 22:43

quote:
Originally posted by Adam_B
depends what spec the cams are.

^^ agreed.as far as i know. i wouldnt risk it tho

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

15th Oct 07 at 22:44

Standard pistons with bigger valve pockets is the way to do it, but forged pistons = higher compression ratio, which means more power

Deano_sxi

Banned

Registered: 10th Apr 05
User status: Offline

15th Oct 07 at 22:50

ask dave

JM_16v

Member

Registered: 17th Oct 05
Location: Essex Drives: GLC63S
User status: Offline

15th Oct 07 at 22:51

Dave A is Vsport

davey_jack

Member

Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
User status: Offline

15th Oct 07 at 23:14

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?

Ste L

Member

Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
User status: Offline

15th Oct 07 at 23:21

early xe's have forged piston's as standard iirc...

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

15th Oct 07 at 23:21

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.

davey_jack

Member

Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
User status: Offline

15th Oct 07 at 23:29

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!

Deano_sxi

Banned

Registered: 10th Apr 05
User status: Offline

16th Oct 07 at 11:38

quote:
Originally posted by JM_16v
Dave A is Vsport

well durrrrrrrrrrrrrr

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline

16th Oct 07 at 14:53

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

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:07

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.

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

16th Oct 07 at 15:08

£500 for pistons, £300 for cams, that leaves £1200 for fitting and whatever else you need. You can do it, definitely.

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:11

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

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:11

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

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

16th Oct 07 at 15:14

My engine rebuild is going to cost me more than I thought then

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:16

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.

TheCam

Member

Registered: 16th Mar 07
Location: Kirkcaldy
User status: Offline

16th Oct 07 at 15:22

what is the advantage of a balanced bottom end?

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

16th Oct 07 at 15:23

revs better, runs smoother, can rev higher without shaking itself apart, it's just better really

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:38

indeed

Stu

Member

Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline

16th Oct 07 at 15:48

Whats the spec of your engine at the moment Dan?

dan_c4rsa

Member

Registered: 12th Dec 06
Location: North Yorks Drives: MK3 Seat Cupra
User status: Offline

16th Oct 07 at 15:51

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.

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

17th Oct 07 at 05:59

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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