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Post by Phil Nottingham on Sept 12, 2014 20:09:02 GMT
He has tried that too
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Post by Deleted on Sept 13, 2014 9:27:02 GMT
Its either out of balance or not firing equally on all eight cylinders at certain rpm. Compressions were equal,I believe they swapped leads and plugs etc on numerous occassions which should rule out the latter. Just a thought though (and there are plenty on here with more experience of the V8 than me) could a hydraulic tappet be 'pumping up' and thus dropping compression at certain revs to give a vibration?.
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Post by johnwp5bcoupe on Sept 13, 2014 9:51:36 GMT
Not running on eight cylinders correctly! put the engine on a diagnostic machine and look at the spark wave form, it will reveal all. I would have started there, taking the engine apart seems a masochistic ( a willingness or tendency to subject oneself to unpleasant or trying experiences)but it takes all sorts. But again thinking about it, this long thread would have not existed so please keep on trying to fix your problem by guessing and posting on here what you do. I'm enjoying reading about all your hard work. Have you thought of meditation for your engines solution? LOL Reading all the posts again Alan I would go along with Steve and Kev and spend out on a rolling road session to rule out any silly faults, it will give power at all stages up the rev range if you have a flat spot due to?? Good Luck Alan you need a bit of it
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Post by Deleted on Sept 13, 2014 9:53:01 GMT
Hi Harvey,
I agree. The choice is between that and remaining cynical as to the qualities of the experts advising Alan which possibility both of us have raised earlier in this thread.
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Post by Welsh Warlock on Sept 13, 2014 11:57:41 GMT
Was put on a rolling road before I pulled the engine the first time - Peter Burgess in Nottingham. 9/4/13 he couldn't find any misfire.
Thanks to all except Steve P5B - There's always someone who thinks they know best and assume everyone else is an idiot. It's posts like yours and one or two others that make people think twice about bothering to share their experiences and tempt people like me to have the thread pulled completely.
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Post by johnwp5bcoupe on Sept 13, 2014 12:22:30 GMT
Was put on a rolling road before I pulled the engine the first time - Peter Burgess in Nottingham. 9/4/13 he couldn't find any misfire. Thanks to all except Steve P5B - There's always someone who thinks they know best and assume everyone else is an idiot. It's posts like yours and one or two others that make people think twice about bothering to share their experiences and tempt people like me to have the thread pulled completely. Sorry Alan I missed the Rolling Road bit What can I add if the experts are stumped
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Post by Welsh Warlock on Sept 13, 2014 15:25:13 GMT
I think the rolling road info was in the original information that was removed by David.
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Post by johnwp5bcoupe on Sept 13, 2014 16:03:38 GMT
I think the rolling road info was in the original information that was removed by David. AH! that will be it well not to worry Alan I know you are/have done a step by step elimination process accept all the help you can if Rob at V8 is willing to help that something! you deserve a bit of luck You know what I would do from our conversation on Sunday
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Post by enigmas on Sept 13, 2014 23:42:19 GMT
You know what I would do from our conversation on Sunday You've got me intrigued John with that last line of conversation?
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Post by johnwp5bcoupe on Sept 14, 2014 5:42:54 GMT
You know what I would do from our conversation on Sunday You've got me intrigued John with that last line of conversation? Alan still has his original 3.5 engine vince
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Post by Welsh Warlock on Sept 14, 2014 8:48:00 GMT
I have.
Its in bits and under the bench. It would need a lot of work and cost to rebuild it which is why I went down the replacement route at the time. Money was more of an issue at that time as its likely to be again in a couple of months unless things change.
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Post by johnwp5bcoupe on Sept 14, 2014 10:13:34 GMT
I have. Its in bits and under the bench. It would need a lot of work and cost to rebuild it which is why I went down the replacement route at the time. Money was more of an issue at that time as its likely to be again in a couple of months unless things change. Alan if I had a good engine I would give it to you you deserve a break Perhaps there is a good Samaritan on the forum who would help
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Post by enigmas on Sept 14, 2014 11:20:49 GMT
I still believe the current engine can be sorted with minimal expense. The issue is something obvious that's been missed. A bit of lateral thinking my dear Watson...that's what's needed!
Perhaps a List. Since the engine received a full balance it's not the rotating and reciprocating components as these were all checked. Although it's been on a dyno, did anyone check each cam lobe for equal lift. I'm assuming the camshaft was run-in for the appropriate time with the correct oil (something with ZDDP) How about camshaft walk? What cam gear set was used? Perhaps an aftermarket non factory set. I'd still like the torque convertor disconnected again to definitively eliminate this rotating mass (as it's an add on after the engine balance)
Other...go for it guys.
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Post by Deleted on Sept 14, 2014 18:45:42 GMT
Alan,
My sympathies. At this stage it if were me I would go for non-Rover (LR) manufacturing and motor engineering advice on this type of problem. As a counter balance. You probably no longer need people who think they know but people with relevant knowledge and wisdom who take your side and explore your questions with your emotion and energy.ie American? Buick? Does it exist in UK? If not US.
Praying!
Peter
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Post by enigmas on Sept 15, 2014 1:54:38 GMT
Just found these comments on a tech board on Mopar V8s re: Balance Factors. It's definitely worth a read. The issues appear to be the same as yours. I'd say your flex plate is from the 3.5 engine? www.moparchat.com/forums/archive/index.php?t-80322.html Comments belowOn the externally balanced engines, the harmonic balancer, and the torque converter both carry balance weight. There are stock weights for stock engines, but if you've replaced internal engine parts, it's going to change. If you haven't, make sure you have a balanced harmonic balancer (one side will have less metal then the other.. a nice size chunk cut out). which engine you actually have, is going to change the weight... is it a magnum motor. (Hybrid) If you use a converter with no balance weights on an external balanced engine then you need the proper external balanced flex plate to make up for it.
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Post by Deleted on Sept 15, 2014 9:36:27 GMT
Well done Vince! At first sight this appears very relevant.
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Post by Welsh Warlock on Sept 15, 2014 12:23:29 GMT
Vince, notice the words " On an externally balanced engine".
This was the case when the engine was originally assemble but has now been taken apart and the components individually balanced including the flexplate and the pulley. Consequently the issue that site raises don't appear valid.
Unless I am missing something
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Post by Steve P5b on Sept 23, 2014 17:31:24 GMT
Was put on a rolling road before I pulled the engine the first time - Peter Burgess in Nottingham. 9/4/13 he couldn't find any misfire. Thanks to all except Steve P5B - There's always someone who thinks they know best and assume everyone else is an idiot. It's posts like yours and one or two others that make people think twice about bothering to share their experiences and tempt people like me to have the thread pulled completely. It is the people that can make resolving the problem tedious, following the correct diagnostic procedure is prerequisite in finding out what the problem is. It's like making a cake you have a recipe for success , just follow it, your car is no different than others and not elite. If you can't find the problem using technical diagnostic equipment then look again. I hope you find out what the problem is so we can all be enlightened.
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Post by Welsh Warlock on Oct 20, 2014 8:31:15 GMT
Not sure what that means Steve but thank you for your good wishes.
Might be time just to forget this now as things are changing in my life so it may be a while before I am able to pursue a result if I can be bothered. I may just move on from the P5 fold as it really is not the community it once was.
You know, actually Steve, thinking about it, it is some of the people that make resolving things like this difficult. Many people seem to think they know the answer, including "the experts" but in reality nobody has provided the solution.
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