Post #1
how many degrees - at the crank can i safely go before i risk bent valves?
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displaying posts 1 to 15 of 15
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 JWP EFi
Turbo Legend!  Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
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 Posted 5th Sep 2012 at 21:46
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #2
At the crank, probably about 4 deg. As this would translate to 2 deg at the cams as they turn at half the speed of the crank.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 5th Sep 2012 at 22:30
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #3
yea, i know cams run at half speed!...4 degrees, is this for both inlet and exhaust? |
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Posted 5th Sep 2012 at 22:34
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #4
Why do you ask ? |
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Posted 5th Sep 2012 at 22:41
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #5
bigbadbowen wrote: Why do you ask ? ..thought there was 10 more bhp and lb ft to be had by advancing timing. |
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Posted 5th Sep 2012 at 22:45
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24seven
Seasoned Pro  Location: Derby Registered: 05 Oct 2005 Posts: 6,221 Status: Offline |
Post #6
There's talk of it bringing the power band slightly down in the rev range if you advance the inlet cam by a couple of degrees making the power more "useable", but I don't recall ever seeing any charts or dyno runs done to prove this. It's one of those things that can ruin your engine if you muck up trying to set it up and there's very little room for error on these engines, so to be honest, I'd just leave it alone. ________________________________________ Ph1 306 GTi 6 | RX8 231 S1 | YBR 125 Cafe Racer | MT-03 660 |
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Posted 6th Sep 2012 at 00:49
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #7
24seven wrote: There's talk of it bringing the power band slightly down in the rev range if you advance the inlet cam by a couple of degrees making the power more "useable", but I don't recall ever seeing any charts or dyno runs done to prove this. It's one of those things that can ruin your engine if you muck up trying to set it up and there's very little room for error on these engines, so to be honest, I'd just leave it alone. Whilst it can be done, ^^ this is the best advice if you don't want to risk internal damage.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 6th Sep 2012 at 07:57
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docwra
Regular  Location: Cambridge UK Registered: 16 Jun 2009 Posts: 217 Status: Offline |
Post #8
It made a noticable difference on mine. Twice in fact. But I cant tell you how much you can safely go as I didnt do it myself either time, sorry  ________________________________________ Lots of Nissans, two 306 GTI-6's. They are catching up! |
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Posted 6th Sep 2012 at 18:00
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #9
I remember Petegti6 doing this back in about 2007, and he gained about 10lb/ft from doing it. Like docwra says, it can be done, but you've really got to know what you're doing otherwsie the engine will go bang. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 6th Sep 2012 at 21:12
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #10
24seven wrote: There's talk of it bringing the power band slightly down in the rev range if you advance the inlet cam by a couple of degrees making the power more "useable", but I don't recall ever seeing any charts or dyno runs done to prove this. It's one of those things that can ruin your engine if you muck up trying to set it up and there's very little room for error on these engines, so to be honest, I'd just leave it alone. so 2 degrees on inlet? i'll try it out this weekend, if i goes pete tong then ive got 3 spare heads/engines so got to be worth a bash, gain of 10 ft lb is a worthy profit considering it wont cost me anything....hopfully |
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Posted 6th Sep 2012 at 22:19
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #11
If you've got plenty of spares and don't mind a bit of trial and error then go for it.  Are you looking to get it on the rollers after to see what sort of difference it made or just drive it and see if it 'feels' any better?  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 6th Sep 2012 at 22:26
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #12
stan_306gti6 wrote: If you've got plenty of spares and don't mind a bit of trial and error then go for it. Are you looking to get it on the rollers after to see what sort of difference it made or just drive it and see if it 'feels' any better? when i bought the car couple weeks back it had decat and magnex, i planned to dyno it before i put cat back on, ive put full o/e system back on so ideally i'd like to advance cam then dyno it followed by second RR run with decat/magnex. i'm assuming 10 ft lb will be fairly noticable out on the road |
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Posted 6th Sep 2012 at 22:30
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #13
Fair enough, you should be able to feel the extra 10lb/ft on the road assuming you manage to gain that figure. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 7th Sep 2012 at 12:35
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,847 Status: Offline |
Post #14
you may not feel it really, as it makes it smoother losing the "kick" people say they feel in ones with the timing retarded.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 7th Sep 2012 at 12:56
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,769 Status: Offline |
Post #15
By doing the mod, it is supposed to bring the peak power down further in the rev range, so there becomes little point in going over the 6.5k etc.________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 8th Sep 2012 at 10:47
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