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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Knock , Knock , who twisted the throdle? /cgi-bin/YaBB.pl?num=1334762629 Message started by MMRanch on 04/18/12 at 08:23:49 |
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Title: Knock , Knock , who twisted the throdle? Post by MMRanch on 04/18/12 at 08:23:49 What would couse : Knock - only above 2000 rpm and only under throdle ? on de-acceleration all the knock goes away (smoth as a babys butt) so from 80mph "Down" to 30mph is just as smoth and quiet as posible (Valves are right), (Bearing are right) , couldn't be quieter ! But from 40mph to 80mph it sounds like the piston is smacking the Head ! What could it be ??? Could cam timing do that ?/?? Something about the Combustion process ???? Its been suggested ; Use the mechanics sethithoscope , tried that , but : unless the motor us under pull its perfect. :-? :-? :-? :-? :-? :-? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by verslagen1 on 04/18/12 at 08:52:04 knock under load could be gas or ignition as in bad gas or bad sparky or plug wire or coil or spark timing. if you didn't swap a four speed for a 5 speed then timing should be ok. You didn't put in a high compression pistion did you? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by Serowbot on 04/18/12 at 09:29:29 Ditto,... the bad gas... If not,.. Have you been running rich?... could be carbon build-up... |
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Title: Re: Knock , Knock , who twisted the throdle? Post by Oldfeller on 04/18/12 at 21:36:03 Hee hee !!! He did a piston, and made himself a high lift cam (loves to weld, he does). |
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Title: Re: Knock , Knock , who twisted the throdle? Post by MMRanch on 04/18/12 at 22:45:10 Yea Versey I did put a wesico piston in (95mm). but the fact is it was making the same noise befor. I thought it was piston slap is what brought on the new piston in the first place. Well I know it not piston slap now. The noise has gotten worse with the new piston. Thought it might be exaust leak at the header , so I put a quiet muffler and new gasket on the head-pipe. tighten the head-pipe first just to make sure it sealed ... then put on the muffler. Still same noise.#@$%^&%&*(&^ it. I'm wondering : Does it seam posible the cam chain has stretched to the point of cousing the valve timing to be slow enought to make a problem or .... did I even get the valve timing right, ( seems like it could have been between (one to fast and next one to slow)). So ... I'm ready to expermit some : Something has to change ; If I jump foward one tooth on the valve timing ???? :-? I run 93 fuel , I call it fuel becouse we doin't get real gas around these parts anymore. but its as fresh as I can get . Shell 93% some times Texaco but at least 92%. |
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Title: Re: Knock , Knock , who twisted the throdle? Post by verslagen1 on 04/18/12 at 23:12:40 How about a different cause... loose nut on the drive pulley? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by Serowbot on 04/18/12 at 23:24:22 I assume with the new piston, that it ain't carbon build-up... I don't think the cam chain could stretch that much without breaking... (can't think it through right now,.. but, would a slack c-chain advance or retard?)... May sound insane,.. but, try some Marvel's Mystery oil, (cap full, maybe two, in the tank... I cured a heck of a racket in a Datsun with that... (did you do valves when you changed piston?)... .. if that don't do it,.. I think you're goin' back in to check the rings n' bearings... PS,.. thanks for the 454 pulley tip,.. I'm workin' on it... ;)... PSS... 203324253A3731333867560 wrote:
WOW!... Versy blew me away with that one!... but, yes... check that pulley... I've been fooled by that sucker... ;).... |
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Title: Re: Knock , Knock , who twisted the throdle? Post by verslagen1 on 04/18/12 at 23:38:04 it's about a degree of retard with every .010" stretch. you did measure your chain while you had it out.... didn't you? but I don't think that would give you a knock. |
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Title: Re: Knock , Knock , who twisted the throdle? Post by MMRanch on 04/19/12 at 08:07:19 It sure is good to have you fellers to bounce things off of ! Serowbot I guess adding a little more mystery into the mix can't hurt anything ;D I woke-up this morning having nightmares about : Combustion( >:() jerking the valves open then letting them slam-shut (Free Fall type) Then the rocker arm catching the falling valve in free fall and knocking it the other way (cartoon style). Didn't make any sense to me either once I thought about it. :-/ I just set the bobbin/Needle timing on a new/returned sewing machine my wife brought home , and can't help but wonder if the same thing is the Savage's problem. ???? Well ... I can re-tork the Head-bolts while I'm in there . If moving the timing chain one tooth fixes it , I'll have a story to tell !!! ???? Heck that will be a story anyway ! :-? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by Oldfeller on 04/19/12 at 11:16:01 Don't do the shift a gear tooth thing --- it is way way way too much. :P Shifting an entire tooth would make your bike run like crap. If you shifted to the "advanced" side you might get what you got now. Might check that line up again though to see if you did accidentally. ====================== Knock only occurs on heavy acceleration, knock is not associated with a bearing location. ====================== basic stuff -- did you check all your engine mounting bolts to make sure they were all tight? I had a hell of a hard acceleration knock when my top and front engine mounts were half tight one time. Look at your frame engine mounting tubes/brackets -- any cracks or broken welds? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by Serowbot on 04/19/12 at 12:24:01 MM,.. don't know if it's related, but I'm getting rubbing against the case with the larger pulley install... Might check yours for clearance... |
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Title: Re: Knock , Knock , who twisted the throdle? Post by MMRanch on 04/19/12 at 12:51:00 Serowbot I did take a few thousands off the outer rim of mine while I had it chucked up in the Lath. Mainly a trueing it up action , but still took off .010 to .015" from the outer rim. If you could let the motor spin the pulley while you put a file up to it , that would amount to the same thing I did. :) I'm going to do what OldFeller suggested. Take it apart and check everything as I go in . If I doin't find anything wrong or loose .????? :-? :-[ :-/ :-/ :( >:( :( get back with you fellers ! ;) |
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Title: Re: Knock , Knock , who twisted the throdle? Post by verslagen1 on 04/19/12 at 21:26:39 392A3D3C232E282A217E4F0 wrote:
did you check the torque? |
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Title: Re: Knock , Knock , who twisted the throdle? Post by MMRanch on 04/19/12 at 21:40:41 So OldFeller If (The Majic Word) :D If Valve are working one tooth ahead of time ... then exaust is opening Half way down and intake is not letting enough in ???? That would make for perty-sorry performance . If Valve are working one tooth behind time .... There could be a lot of Vacum on the intake stroke , and with an open throdle the valve could(?) get pulled away from the rocker arm ??? then slap back to it at some point . ????? That seem posible ???? It seem like the marks wouldn't level , it was either go tilt forward or backwards I think I chose forward ??? but can't remember for sure ! :-[ I'm going to have to take the top off again (like it or not :-X). But it probley time to re tork the head bolts anyway. |
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