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> Tear it down?, My engine that is...
stock93
post Sep 16 2003, 10:50 PM
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I have a 71 1.7. The compression is 132, 130, 140, and 112. If I squirt some oil in the cylinder with 112 it come up to about 165. Would you guys go ahead and tear it down to re ring it or just run it? It has next to no power. I think I have some other problems as well. Its slower than a 1500sp in a ghia. Its also making a strange noise from idle to around 3000rpm. Then it just goes away. The best way I can describe it is it sounds like a rickety old washing machine. Any ideas?

John
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stock93
post Sep 16 2003, 10:53 PM
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Forgot to add, valves are adjust correctly to .006" Tune up has been performed. This car was sitting for 5 years. Sometimes it idles at 2K when hot. Other times it wants to idle at around 800.

John
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Brad Roberts
post Sep 16 2003, 11:07 PM
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I would just run it until you have the money/time to install a good used 2.0 engine... or you could tear it apart and make it a 1911 with new P+C's and have the heads opened up for the new cylinders..

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stock93
post Sep 16 2003, 11:24 PM
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Eventually I want to go bigger. I just dont have the money at the moment. Are the Heat exhangers the same where they bolt to the heads on the 1.7, 1.8, and 2.0? I'd like to build either a 2056 or a 2270. Any idea on the odd noise? Do the rivets in the cam gear come loose on these often?

John
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Brad Roberts
post Sep 16 2003, 11:30 PM
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I have never seen the rivets come loose.. It could happen I guess.

all the exhausts will fit the other engines (the 2.0 exhaust on a 1.7 really kicks it in the ass and makes it breath better).

Your description on the noise leaves a little to be desired (cant tell what the hell your trying to tell me... (IMG:style_emoticons/default/laugh.gif) )



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stock93
post Sep 16 2003, 11:37 PM
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I wish I had a better way to describe the sound. It sounds like a valve clatter but its raspier than that. It goes away on acceleration and then comes back with a spike before leveling back to its normal level when you let off the gas. It doesnt matter if there is a load on the engine or not. Its definately rpm related. I guess I need some way to record the noise and then put it to a .wav file. The local VW guys havent been able to figure out what it is.

John
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Brad Roberts
post Sep 16 2003, 11:40 PM
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Tighten all the valves to .003 or zero. Then come back and tell me what it is doing. It sounds like something is coming apart.


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stock93
post Sep 16 2003, 11:44 PM
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Brad,
I just did a valve adjustment. All the valves were at zero. I backed them off to .006" The noise got slightly more quiet I think but I may just have imagined it. It does sound like something is comming apart to me to. I'm wondering if I have a valve seat that is about to drop but I would think that would get louder with more rpm.

John
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Brad Roberts
post Sep 16 2003, 11:49 PM
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If the valves tighten on one cylinder.. the seat is dropping (valves moves closer to the adjuster) I cant imagine ALL of them dropping at the same time unless you over heated the engine with something blocking the cooling fan.


The noise does sound like seats dropping (now that I think about it).. they can slip out of the bores a little bit and go back in at high RPM..



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stock93
post Sep 16 2003, 11:52 PM
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I'll check clearances again. I have no idea the history on the car other than it sat up for 5 years before I got it. Another guy suggested the muffler baffles came loose and are rattling aorund like crazy until they get enough pressure from higher rpm to hold them in place. Thanks for the help so far Brad.

John
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Brad Roberts
post Sep 16 2003, 11:55 PM
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Easy enough.. pull the muffler off and shake it around. If its rusted inside... shit will fall out..

Make sure you have a new set of gaskets ready to go back on.


OR.. you can tap on the muffler and listen for moving parts...



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stock93
post Sep 17 2003, 12:16 AM
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I tapped on it with a rubber mallet just a second ago. I dont hear anything moving around in it. I wonder if the PO burned the valves bad enough to make them clatter. Would it hurt anything if I took the pushrods out cylinder and see if it went away?

John
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Brad Roberts
post Sep 17 2003, 12:20 AM
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The compression from what ever cylinder you pulled the push rods from would have nowhere to go... I wouldnt suggest it. Pull plug wires while the engine is running... and see if you can find a cylinder that "changes" when it has no load on it. Be careful with the spark.



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stock93
post Sep 17 2003, 12:25 AM
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I already tried that one the other day. There was no change other than just normal from pulling a plugwire.

John
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Brad Roberts
post Sep 17 2003, 12:26 AM
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Drive it until it BLOWS.. (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/laugh.gif) sorry. I try not to waste too much time on 1.7 engines...



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stock93
post Sep 17 2003, 12:37 AM
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Thanks for all the help anyway. Its barely driveable. I have to just about slip the clutch in first to get up my driveway. I guess I'll just drive it till it lets go if I cant figure out what it is. Time to start looking for a cheap 2.0L. I did disconnect the alternator belt just to be sure it wasnt hitting the brushes in it or something strange like that.

John
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Brad Roberts
post Sep 17 2003, 12:39 AM
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If you where close to me.. I would give you a complete 1.7 engine to play around with..


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stock93
post Sep 17 2003, 12:41 AM
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Sounds like I need to move (IMG:style_emoticons/default/smile.gif) I have found one 914 engine around here. That was a couple of years ago. I have a 2.0L type IV bus engine in my rail. That is the only other type IV I have been able to find.

John
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Brad Roberts
post Sep 17 2003, 12:48 AM
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We have several members from the Huntsville area on the BBS. They should be able to hook you up..

Oh.. I do suggest moveing from there to here.. we have MUCH better weather with NO humdity... now if we just had your taxes and your gas prices..we would be OK.


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Jake Raby
post Sep 17 2003, 12:56 AM
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The sound could be a loose cam gear, or alos coulkd be a loose lower pin in the oil pump hitting the cam gear.......Or the thrust surface on the #3 cam bearing could be wiped out causing the cam to "dance" freely in the journals (this is heard more at low RPM on start up and shut down)

I would atleast rip it down and make it a 2056.....
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