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Author Subject: Cam Advance
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #26
Pretty much, yeah.

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Posted 18th Jan 2012 at 06:57
adam b

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Post #27
Yes and no. Was getting around to finding a new engine anyway and drove it a fairly long way after the hg went. Wasn't obvious the hg had gone as sounded like a small miss, then suddenly got a lot worse and died on me.

Don't think advance did much damage as I had it on there for 60k odd...

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Posted 18th Jan 2012 at 12:20
atterz

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Post #28
Just wondering about the advance settings and anywhere that may know how to do it? More midrange sounds like a good idea to me!

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Posted 18th Jan 2012 at 14:47
allanallen

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Post #29
atterz wrote:
Just wondering about the advance settings and anywhere that may know how to do it? More midrange sounds like a good idea to me!


First thing you need to do is accurately measure your head to check if it's ever been skimmed and if so by how much. If its had a heavy skim in the past you can't really go advancing it.

There's loads of info on here and drivers about how to do it. I do it the lift at TDC method, I know people in the past have guessed it but I strongly advice against it.
1.4 mm of lift at TDC (inlet)is generally considered the max to go on an un-skimmed head although I think toddy has run 1.7 on his.
I couldn't recommend anyone to do it though I'm afraid.

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Posted 18th Jan 2012 at 15:36
atterz

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Post #30
Is it possible to check if the head is skimmed without removing it? Ie through the spark plug holes with the pistons at TDC?

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owain wrote:
A GTI-6 with a good dashboard and the seats down can outsprint an E46 M3 in July.
Posted 18th Jan 2012 at 17:39
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #31
atterz wrote:
Is it possible to check if the head is skimmed without removing it? Ie through the spark plug holes with the pistons at TDC?


Not easily, the skimming mark is on the underside of the head on the gasket face. Wink

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 18th Jan 2012 at 18:40
maddriver9

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Post #32
both cams on my old engine were rotataed if not all the way it was a lot, could not say if advanced or retarded though. made 178 bhp and 140 torque dont no if it helped.

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Posted 18th Jan 2012 at 21:24
stan_306gti6 Forum Admin

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Post #33
maddriver9 wrote:
both cams on my old engine were rotataed if not all the way it was a lot, could not say if advanced or retarded though. made 178 bhp and 140 torque dont no if it helped.


Standard torque figure is 145lb/ft so you were 5lb/ft down, but 11bhp up so I'm guessing you had the inlet advanced and the exhaust retarded slightly.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 19th Jan 2012 at 12:14
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #34
just took the head off this wallye, felt slow midrange but still liked 7k rpm.

sure enough the inlet was retarded half a pin compared to the exhaust, couldn't say specifically how far compared to the crank as the bottom pulley was fubbared LOL:

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Posted 19th Jan 2012 at 12:43
allanallen

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Post #35
stan_306gti6 wrote:
maddriver9 wrote:
both cams on my old engine were rotataed if not all the way it was a lot, could not say if advanced or retarded though. made 178 bhp and 140 torque dont no if it helped.


Standard torque figure is 145lb/ft so you were 5lb/ft down, but 11bhp up so I'm guessing you had the inlet advanced and the exhaust retarded slightly.


Im of the impression an advanced inlet should give more mid range torque whilst sacrificing a lttle peak bhp. I'm guessing mad driver is running aftermarket cams though with those figures.

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Posted 19th Jan 2012 at 13:37
adam b

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Post #36
Hi Allan,

Not necessarily, seems a bit strange the low torque though. Mine consistently made 178/179 BHp and 155/156lbft on a variety of rolling roads with standard exhaust and basically standard inlet.

What I did notice is that power really tailed off a lot after 6k rpm, but torque came in lower so happy days. Was quite a bit quicker straight line than other standard cars.

Cheers

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Posted 19th Jan 2012 at 13:44
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #37
allanallen wrote:
atterz wrote:
Just wondering about the advance settings and anywhere that may know how to do it? More midrange sounds like a good idea to me!


First thing you need to do is accurately measure your head to check if it's ever been skimmed and if so by how much. If its had a heavy skim in the past you can't really go advancing it.


depends which gasket was used Wink


I just measured a single bolt cam pulley, the slot gives a total adjustment of 12.5 degrees, 1.5 teeth.

looking back at Adam's cam pulley pics they look to be near as dammit fully rotated which would be around 6 degrees from the usual position when pinned, though belt tension when assembling can alter this a little.

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

Bring on the Trumpets.

Posted 19th Jan 2012 at 13:55
allanallen

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Location: Buxton

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Post #38
adam b wrote:
Hi Allan,

Not necessarily, seems a bit strange the low torque though. Mine consistently made 178/179 BHp and 155/156lbft on a variety of rolling roads with standard exhaust and basically standard inlet.

What I did notice is that power really tailed off a lot after 6k rpm, but torque came in lower so happy days. Was quite a bit quicker straight line than other standard cars.

Cheers


Clearly not reduced the bhp in your case! I know on mine the mid range was vastly improved but I lost some of the 'kick' when it comes on cam. As you say the power seems to tail off after 6k ish. I'm perhaps wrongly assuming its lost some top end power, when in reality the improved mid range has made the top end feel worse than it is (hope that makes sense?!)
The point I was getting at is that maddrivers figures don't suggest an advanced inlet as he's lacking torque whereas it should of gained some. I'd say if it's on standard cams the inlet is somewhat retarded.

Welshpug, good point about the repair gaskets. I'm still yet to see one myself, infact the last 6 engine I stripped had recently had a head fitted at a specialist and they'd re-used the original head gasket! Not to mention fitting cam carriers off a different head, but I digress :p

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Posted 19th Jan 2012 at 15:13
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #39
crikey, some specialist! wasn't Scottish by any chance? Ninja

mine drove pretty similarly to Adam's before I changed my inlet cam, less eager to nut the limiter like many standard timed cars do, and no "kick" but real world pace on twisties was better.

Never got a chance to RR it, its got both PH2's in now and still idles lovely on the standard map, but the shell is bent Sad

Citroen list a repair gasket for the RS lump, its 1.4mm, standard iirc is 1.2, though any XU10 gasket will do the job.

________________________________________

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

Bring on the Trumpets.

Posted 19th Jan 2012 at 15:20

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