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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sat Feb 05, 2005 3:29 am |
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looks like the meganes engine is shafted. 7k rpm in second gear, and the whole things cuts out with a bang. aa bloke sez theres compression on 3cyls but not on one pot. looking at valve and piston damage. im thinking valve float which then got collected by a piston, or a collets gone and dropped a valve. either way its buggered and its gunna cost big bucks. oh the joy...
jimbo |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Sat Feb 05, 2005 4:33 am |
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thats a tad crap. You did say it was running crap though so it may have been something else matey.
Valve float doesn't tend to cause valve damage, they just get shoved back up.
The float rpm effectively limits engine speed anyway |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sat Feb 05, 2005 9:34 am |
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ok, well the heads off. heres the story;
the cause of the problem was the exhasut cam pulley bolt shearing off inside the thread, causign the pulley to become loose, and generally bugger things up.
the damage is 2 bent valves! woohoo. 2 zorst valves on cyl 2 are bent. the pistons r unscathed, bar 2 dings. getting jonboy on the case of sorting the head.
jimbo |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Sat Feb 05, 2005 11:17 am |
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lol result I suppose.
I sheared the traditional earth braid bolt to the gearbox today. |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sat Feb 05, 2005 12:01 pm |
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they are the same as F7P ex valves...i have plenty of them |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sat Feb 05, 2005 1:46 pm |
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cheers matey, ive got JB sorting the head tomorrow.
jimbo |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sat Feb 05, 2005 1:53 pm |
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wats the best method of blocking off the EGR? i think ive damaged the gas pipe from the exhasut mani when i removed the head today. i take i would need to keep the valve fitted and wired up, but block of the exhaust gas connections at the manifold end, and the inlet end?
jimbo |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sat Feb 05, 2005 2:04 pm |
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yuo could do that, or make a plate up so you actually remove the valve from the manifold |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sat Feb 05, 2005 3:03 pm |
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yeah i was thinking of a small blanking plate, but then the wiring plug wud be left unconnected, so might cause an ECU fault?
jimbo |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sat Feb 05, 2005 4:13 pm |
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wouldnt have thought so. try disconnecting it with the valve in tact...just to make sure |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Sun Feb 06, 2005 4:10 am |
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yeah blanking plate. As for it flagging up a fault, not 100% sure on that one matey, it might or it might not! |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sun Feb 06, 2005 3:44 pm |
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well the new valves r in. cheers jonboy. the old valves wer a bit erm... bent, lol. got it all reassembled now, shud be refitting it this tuesday.
jimbo |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sun Feb 06, 2005 3:48 pm |
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good good...not too expensive then! |
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Roger Red Hat
Site Subscriber
Joined: 13 Oct 2004
Posts: 4722
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Sun Feb 06, 2005 3:52 pm |
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why exactually where you doing 7k in 2nd?
just wonderin :/ |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Sun Feb 06, 2005 4:03 pm |
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why not?!
what are these engines like for revving jimbo? i hear they dont like it past 7k? (obviously not including you recent failure cos that was the cam bolt) |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Feb 07, 2005 2:16 am |
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| Roger Red Hat wrote: |
why exactually where you doing 7k in 2nd?
just wonderin :/ |
cos thats where all the fun is  ..........usually |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Feb 07, 2005 3:14 am |
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they will go to 7krpm but they balancing from the factory is crap so they are a bit rough, however if you get em balanced much smoother. |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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Mon Feb 07, 2005 3:29 am |
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i was considering getting my 2.0 crank balanced....may aswell if its almost out anyway |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Feb 07, 2005 3:31 am |
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like I said before the stock balancign is terrible. On tghe chamade at 2800rpm I have a very rough area and it comes back just under 7k, its a blaance prob nothign else.
You will notice the diff. |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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Mon Feb 07, 2005 7:46 am |
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| jimbo wrote: |
well the new valves r in. cheers jonboy. the old valves wer a bit erm... bent, lol. got it all reassembled now, shud be refitting it this tuesday.
jimbo |
you're welcome |
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Roger Red Hat
Site Subscriber
Joined: 13 Oct 2004
Posts: 4722
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Mon Feb 07, 2005 8:13 am |
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when is maximun bhp being produced...at what rpm? on thses engines |
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