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displaying posts 1 to 25 of 31
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| Author | Subject: bp270 cams fitted tapping noise |
 tobias.gtr
Newbie  Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #1
hello i have fitted a set of bp270 cams but now have a a light tapping noise the cams are dialled in correctly i have found a invoice to say the head has been skimmed before i bought it so i think i have piston to valve contact would it be best to pocket the pistons or get a thicker head gasket/________________________________________ tobias |
 Posted 25th Mar 2016 at 21:36
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jeffers
Forum Admin Location: Leeds Registered: 14 Dec 2003 Posts: 3,702 Status: Offline |
Post #2
Sounds like you need to measure the head to be sure how much has been taken off it...________________________________________ Team Running Engine again!Team Negative Camber! My Budget track engine build thread! Now appearing at a Trackday near you!!  |
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Posted 25th Mar 2016 at 22:22
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Day666
Seasoned Pro  Location: Bristol Registered: 20 Apr 2013 Posts: 5,214 Status: Offline |
Post #3
I really hope Tobias it's not bad news m8 !Keep us posted m8 |
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Posted 26th Mar 2016 at 06:41
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #4
does anyone know if i would be able to retard the cams to give enough clearance and what effect that would have on power ________________________________________ tobias |
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Posted 26th Mar 2016 at 08:39
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #5
Who put the cams in ? And how did you rotate them to line them up ?? |
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Posted 26th Mar 2016 at 09:08
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #6
i fitted them i am mechanic and was very careful not to make piston and valve contact at tdc i could only move the inlet cam 5 degrees each way before it touch the pistons iv had them check by a good friend who owns a engineering company and they are spot on the inlet was 110 atdc and exhaust 110 btdc ________________________________________ tobias |
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Posted 26th Mar 2016 at 09:43
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bigbadbowen
Seasoned Pro Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #7
I mean when you put them in did you rotate either of them to get them to the correct position ? I usually put cams in and bolt down the carriers so that the cams are very near to the correct position then just move them slightly to get them timed ? The exhaust can usually slips forward so some people just rotate it all the way round again which bends valves |
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Posted 26th Mar 2016 at 10:20
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,838 Status: Offline |
Post #8
they dont pin up at tdc anyway, Valve to valve contact is more of a concern when fitting cams.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 26th Mar 2016 at 11:16
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #9
does anyone now if i would be able to retard the cams to give enough clearance and what effect that would have on power ________________________________________ tobias |
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Posted 26th Mar 2016 at 12:53
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jeffers
Forum Admin Location: Leeds Registered: 14 Dec 2003 Posts: 3,702 Status: Offline |
Post #10
tobias.gtr wrote: does anyone now if i would be able to retard the cams to give enough clearance and what effect that would have on power I think your missing the point here, if you've put the cams in and there's been valve to piston contact even minimal, you'll more than likely have bent valves. Also when fitting cams to these engines rotating either cam individually will likely cause valve to valve contact... And bend valves. In answer to your question yes cams can be fitted retarded however they'll likely achieve nowhere near there potential. ________________________________________ Team Running Engine again!Team Negative Camber! My Budget track engine build thread! Now appearing at a Trackday near you!! |
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Posted 26th Mar 2016 at 13:21
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #11
jeffers wrote: tobias.gtr wrote: does anyone now if i would be able to retard the cams to give enough clearance and what effect that would have on power I think your missing the point here, if you've put the cams in and there's been valve to piston contact even minimal, you'll more than likely have bent valves. Also when fitting cams to these engines rotating either cam individually will likely cause valve to valve contact... And bend valves. In answer to your question yes cams can be fitted retarded however they'll likely achieve nowhere near there potential. Exactly this...  You have more than likely bent valves through valve "tangling" as opposed to valve to piston contact. However, as Welshpug pointed out the cams do not get timed with any piston at TDC - the pistons are all at half stroke when you need to be timing them, in accordance with the crank pulley timing hole. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 26th Mar 2016 at 18:00
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adam b
Seasoned Pro  Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #12
If the pulley isn't shagged and the outer bit hasn't slipped. Then the timing hole won't be in the right place.________________________________________ Nothing to see here |
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Posted 27th Mar 2016 at 12:55
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #13
adam b wrote: If the pulley isn't shagged and the outer bit hasn't slipped. Then the timing hole won't be in the right place. If someone is competent enough to fit aftermarket cams, I'd hope they would know about lining the bottom end correctly. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 27th Mar 2016 at 15:04
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,838 Status: Offline |
Post #14
You'd think so, but the number of engines from supposedly competent garages ive seen with tippex marks everywhere instead of using pins, and not pinnibg before starting, you wonder how they are still in business________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 27th Mar 2016 at 15:17
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adam b
Seasoned Pro Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #15
stan_306gti6 wrote: adam b wrote: If the pulley isn't shagged and the outer bit hasn't slipped. Then the timing hole won't be in the right place. If someone is competent enough to fit aftermarket cams, I'd hope they would know about lining the bottom end correctly. True but he is asking about retarding the cam timing even though it's already tapping. ________________________________________ Nothing to see here |
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Posted 27th Mar 2016 at 16:26
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #16
Yeah, this is true...Seeing as the piston clearance is so small on these engines with standard cams, fitting higher lift cans without knowing the full history of head skimming etc is always going to be a risk. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 27th Mar 2016 at 17:04
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bigbadbowen
Seasoned Pro Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #17
Bp270 cams are very mild my money is on rotated cam |
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Posted 27th Mar 2016 at 17:47
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #18
the reason I'm asking about retarding cams is iv had engines that have slipped a tooth and sound like diesels put a new belt on timed back up and been fine and by retarding the cams slightly will move the power band further up the rev range and will give bigger valve clearance ________________________________________ tobias |
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Posted 27th Mar 2016 at 23:06
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #19
These are not the kind of engines whereby you can slip a tooth on the belt and retime them and find they run perfect... And as Bowen says, 270's are mild, the issue has probably been caused by valve tangle due to 360 degree rotation of exhaust cam on fitting. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 28th Mar 2016 at 08:09
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,838 Status: Offline |
Post #20
the damage is already done, time to take the head off.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 28th Mar 2016 at 11:28
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #21
will get the head off this week and have a look ________________________________________ tobias |
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Posted 28th Mar 2016 at 11:58
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bigbadbowen
Seasoned Pro Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #22
You still haven't answered the question - did you rotate the exhaust cam to line up the holes ?? |
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Posted 28th Mar 2016 at 14:31
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #23
i didn't line the holes up as the vernier pulleys don't have the holes in so i used a piston stop to find the true tdc and then set the inlet cam to 110 atdc and then put the exhaust cam routhlyin in the right place then carefully turned the engine to tdc and adjusted the exhaust cam so number 4 was rocking and then turned the engine to 110 btdc and set the exhaust came i then turned the engine over 10 times by hand and didn't fill no contact ________________________________________ tobias |
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Posted 28th Mar 2016 at 19:11
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bigbadbowen
Seasoned Pro Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #24
That's not how I would of done it ! I'd of used the old pulleys to line up the cams then with the cam covers off I'd of used some mole grips to hold the cams in place then swapped the pulleys |
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Posted 28th Mar 2016 at 19:18
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tobias.gtr
Newbie Location: bristol Registered: 23 Jan 2016 Posts: 19 Status: Offline |
Post #25
ok i will give that ago when i say its tapping its fine on tick over but as you pick the reves up you can hear it if i didn't hear the engine before i fitted the cams i would say it a slightly sticky lifter. why i was thinking it might not of bent the valves is i bought a cosworth years ago that was very tappy and it turned out that someone timed it up on the wrong mark on the bottom pulley they drive it like that for a good 6 months before i bought it i fitted a new belt timed it up properly and was fine but i do under stand that the tolerances are a lot tighter on the gti6 ________________________________________ tobias |
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Posted 28th Mar 2016 at 19:37
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