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Author Subject: Max lift at TDC?
dan gti-6

Regular

Location: Winchester

Registered: 26 Jan 2008

Posts: 112

Status: Offline

Post #26
Im unsure on prices to be honest but will find out tomorrow and report back!

Yeah ideally you want aftermarket piston so you can raise the CR as well as gaining valve clearance.

I just got the impression from the first page that you wanted to build an engine properly but on a budget, which is fine ive been thinking about building an 88mm lump for a while!

Bear in mind pistons are about
Posted 20th May 2009 at 23:13
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #27
Well so far from the bits I've got I can build an engine with a 10.9 compression ratio, or if I get hold of an 88mm crank 13-1 LOL

The actual parts have cost me about

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Posted 20th May 2009 at 23:38
matty_rallye

Senior User

Location: Devizes

Registered: 28 Oct 2005

Posts: 966

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Post #28
An alternative is to have Nissan pistons machined (see pic) and fitted which is what Sandy fitted into mine. 87mm though so block will need to be bored.

________________________________________

2.1 16v 306 Rallye.
Posted 21st May 2009 at 00:36
dan gti-6

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Location: Winchester

Registered: 26 Jan 2008

Posts: 112

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Post #29
matty_rallye wrote:
An alternative is to have Nissan pistons machined (see pic) and fitted which is what Sandy fitted into mine. 87mm though so block will need to be bored.


What pistons are they exactly?

I rebore alot of nissan blocks at work and flat top RB25 (GTS) pistons look similar to 6 ones, although i havent got round to measuring either up yet!
Posted 21st May 2009 at 04:10
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #30
RB25 is 86mm though?


Doh of course they aren't after a rebore LOL

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Posted 21st May 2009 at 04:17
matty_rallye

Senior User

Location: Devizes

Registered: 28 Oct 2005

Posts: 966

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Post #31
N/A 300zx pistons!

________________________________________

2.1 16v 306 Rallye.
Posted 21st May 2009 at 23:39
vts_tibi

Seasoned Pro

Location: Nuneaton

Registered: 27 Apr 2007

Posts: 1,194

Status: Offline

Post #32
I have a Peter Taylor stg.1 inlet camshaft, and I would be curious what you guys think about it's specs. :

"Duration 226 deg. @ 0.050"
Max. Lift 0.350"
Lift @ TDC - 0.065" (but a range of 0.065-0.075 is acceptable for fine tuning)"


It's a regrind from an XU10J4R camshaft to stg.1 XU10J4RS spec.

________________________________________

VTS
best 60' : 2.272
best 1/8 ET : 9.375 @ 74.42mph
best 1/4 ET: 14.603 @ 97.047mph

Team Trackday™
Posted 22nd May 2009 at 15:38
sandy

Junior User

Location: Truro

Registered: 02 Oct 2005

Posts: 70

Status: Offline

Post #33
matty_rallye wrote:
N/A 300zx pistons!


It was far too much work, I'm not in a hurry to do that again!
Posted 23rd May 2009 at 13:19
mark-house

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Location: Bury St Edmunds

Registered: 07 Apr 2009

Posts: 1,096

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Post #34
So to fit some uprated cams and to have safe clearance at TDC what pistons are required? Im assuming some forged aftermarket ones but does anyone know who makes them?

________________________________________

Peugeot 306 GTi 6
BMW 320 td compact M-sport
1967 Mini Cooper
1990 Jaguar XJR 4.0
Posted 26th May 2009 at 17:52
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #35
Wossner, Accralite, Omega, JE, Arias, Cosworth Mahle and many many others.

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Posted 26th May 2009 at 18:07
o_tateuk

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Location: Oakham

Registered: 12 Mar 2009

Posts: 119

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Post #36
F**k im taking my cams out! LOL

________________________________________

Ex team china wish i hadnt done it but oh well.

Now saving up the dollas for a nice bianca rallye! May the search commence!!!!
205 1.8 Derv! (The work run slag) Big grin
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Posted 3rd Jun 2009 at 04:18
chris with a pug

Seasoned Pro

Location: Southampton

Registered: 16 Feb 2003

Posts: 5,366

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Post #37
dan gti-6 wrote:
matty_rallye wrote:
An alternative is to have Nissan pistons machined (see pic) and fitted which is what Sandy fitted into mine. 87mm though so block will need to be bored.


What pistons are they exactly?

I rebore alot of nissan blocks at work and flat top RB25 (GTS) pistons look similar to 6 ones, although i havent got round to measuring either up yet!


where do you work?
Posted 3rd Jun 2009 at 05:31
buzzbrightyear

Seasoned Pro

Location: hiding all receipts for car

Registered: 09 Jul 2008

Posts: 11,894

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Post #38
i can remember the thread a while back with the guy having so much trouble with fitting pt82`s(i think).

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 9th Jul 2009 at 14:06
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #39
now you know why!

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Posted 9th Jul 2009 at 15:59
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #40
vts_tibi wrote:
I have a Peter Taylor stg.1 inlet camshaft, and I would be curious what you guys think about it's specs. :

"Duration 226 deg. @ 0.050"
Max. Lift 0.350"
Lift @ TDC - 0.065" (but a range of 0.065-0.075 is acceptable for fine tuning)"


It's a regrind from an XU10J4R camshaft to stg.1 XU10J4RS spec.


I forgot to post the details I had got from Newmans on their PH2-

quote:

Hi There,

Lift @ TDC is 1.14mm,
Duration @ 1.0mm is 222.5 Degrees,
Duration @ 0.1mm is 256,
Duration @ 0.0762mm is 264 Degrees.

Regards,

Ken Newman


quite difficult to compare what with the metric and imperial measurement mix used Doh

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 16th Dec 2009 at 17:10
adam b

Seasoned Pro

Location: The Nam

Registered: 24 Jan 2006

Posts: 12,825

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Post #41
Have you worked out the cc of the engine you are considering then Mei?

I was wondering about getting a couple of PeterT's cams ages ago, but decided i'd get more from making the chassis and brakes good. Your ZX is hardly slow as it is Smile

________________________________________

Nothing to see here
Posted 16th Dec 2009 at 18:05
petert

Newbie

Location: Sydney

Registered: 18 Mar 2007

Posts: 38

Status: Offline

Post #42
welshpug! wrote:

quite difficult to compare what with the metric and imperial measurement mix used Doh


Not really, eg

1.14mm = 0.045"
my cam has 0.065" at TDC, thus the inlet valve is opened earlier (given the same centreline)

PH2 : 222.5 @ 1mm

My Mi16 Stage I 16H426B : 234 deg @ 1mm

so is significantly bigger and would definitely be a candidate for smashing valves into pistons if not setup correctly. Magic used it and got some very impressive hp figures.
Posted 17th Dec 2009 at 09:56
vts_tibi

Seasoned Pro

Location: Nuneaton

Registered: 27 Apr 2007

Posts: 1,194

Status: Offline

Post #43
at which angle does my camshaft have 1mm lift Peter?

stg.1 inlet camshaft

Duration 226 deg. @ 0.050
Max. Lift 0.350"
Lift @ TDC - 0.065

regrind from an XU10J4R camshaft to stg.1 XU10J4RS spec.

________________________________________

VTS
best 60' : 2.272
best 1/8 ET : 9.375 @ 74.42mph
best 1/4 ET: 14.603 @ 97.047mph

Team Trackday™
Posted 17th Dec 2009 at 18:09
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #44
I was meaning the difference in duration, i.e you measure your cam at 0.050" which is 1.27mm, giving 226 deg.

Newmans measure at 1mm. and give 222.5mm.

what does your gti6 cam give at 1.0mm/0.0393"?

I might be interested in sending an XU10J4R or XU7 cam, or even a J4RS cam for a stage 1 grind, the results you and Magic have got from them are quite impressive I mus say Smile



Adam the engine I considered putting toge3ther would have ended up at either still at 1998 cc on the standard crank but with 2.0 RFY mi16/s16 pistons and rods and 10.9-1 compression or using a 1.9 88mm crank for 2044cc, that would need some piston skiming or a thicker gasket, or some chamber relief work as it'd give a 13-1 compression as is Shock

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 18th Dec 2009 at 03:01
adam b

Seasoned Pro

Location: The Nam

Registered: 24 Jan 2006

Posts: 12,825

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Post #45
Yes I got it after you explained it earlier! Interesting thread this Ninja

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Nothing to see here
Posted 18th Dec 2009 at 04:21
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #46
very interesting once more, as my headgasket has died Sad Doh

anyone know where and how much it'd cost to have the cutouts made a little deeper?

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 7th Jan 2010 at 04:11
allanallen

Seasoned Pro

Location: Buxton

Registered: 01 May 2007

Posts: 1,399

Status: Offline

Post #47
welshpug! wrote:
very interesting once more, as my headgasket has died Sad Doh

anyone know where and how much it'd cost to have the cutouts made a little deeper?



Pm martin (crf450), I believe hes done a few sets now

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Posted 7th Jan 2010 at 14:04
cjm_harris

Seasoned Pro

Location: Parts for Sale section

Registered: 04 Dec 2007

Posts: 7,442

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Post #48
allanallen wrote:
welshpug! wrote:
very interesting once more, as my headgasket has died Sad Doh

anyone know where and how much it'd cost to have the cutouts made a little deeper?



Pm martin (crf450), I believe hes done a few sets now


Is this standard pistons?

________________________________________

Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 7th Jan 2010 at 14:05
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #49
yes Mr Harris, would enable you to run cams like PT81's or PT82's etc without fear of bending valves.

Allanallen, thanks for the tip I'll PM him now, AdamB got a price from the machine shop a few doors down from him, initial setup cost was quite a bit but gets cheaper and cheaper the more sets are done.

I "think" sandy can sort them too so I'll ask him as well.

I'm going to see how much extra room is needed for the first step or two in cam upgrades, generally these don't need uprated pistons I dont think.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 8th Jan 2010 at 01:07
mxcrazy

Regular

Location: hastings

Registered: 22 Jun 2009

Posts: 456

Status: Offline

Post #50
I am too pondering on cam shafts at the moment, i think with the pistons i have that i will be able to have some fairly large max lift figures, the cut outs are reasonably large. But, i dont want to have to rev this thing real hard to get the power from it.

Welshpug, i have the drawings of these pistons ive got, do you want a look? ill have to email them over.
Posted 8th Jan 2010 at 01:19

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