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  #1  
Old 12-07-2002, 04:17 PM
wallyghs wallyghs is offline
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Idea Slanted troubles

My slant has low cranking pressure (sub 90psi) on 2 cylinders and the other 4 are all over the map... 110-150 (lowest is 65psi). The engine has no power whatsoever. I put some engine treatment stuff in it to see what it would do... I got nothing. In an attempt to gain some power(I don't care if it's high end or low end.. I just want something) I started swapping out carbs. it has a 4bbl offenhauser intake on it. I tried a 670 street avenger and it would make a whistling sound at around half throttle. Horrid bottom end power but around 4000 it would start to pull(with the throttle pegged.. still half throttle it whistled and dragged). Tried a 360 2bbl, no more whistling but no power anywhere. 318 2bbl carb gave me back a bit of the low end power but wouldn't do anything past around 2000. Stock single barrel wouldn't even run(it needs a rebuild). now I didn't really do anything to these carbs besides try and adjust idle mixtures and float levels. Not real technical cause I don't want to put my time or effort in this junk.. just would like it to run eventually (my truck has a collapsed lifter so I gotta pull it down). Any ideas on getting it to at least run?
Oh, I tried a phord carb on it too... of a 351W... that ran the best as long as I left the choke on...lol.

I know all of the carbs need rebuilds... most are off of junk motors that have been sitting around with water in them... but I just want something to run. Leave the windsor carb on it and force the choke all the time or work on the street avenger (which is semi-new... i think adjustments are waay off on it tho)... the other carbs are prolly shot. Any idea why the avenger would whistle at half throttle? I don't know jack about carbs so help me out. thanks.
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  #2  
Old 12-07-2002, 11:07 PM
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ehostler ehostler is offline
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Don't fuss over the carbs, until you get the cranking pressure issue resolved. No carb in the world is going to run right, with those problems.
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  #3  
Old 12-08-2002, 12:14 AM
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dave571 dave571 is offline
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Ed's bang on.

It' doesn't matter what carb you have, if you have a couple of bad holes. No carb can tune that away.
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  #4  
Old 12-08-2002, 01:01 AM
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dwc43 dwc43 is offline
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Time for a rebuild with those shot holes.
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  #5  
Old 12-08-2002, 05:40 PM
wallyghs wallyghs is offline
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Like my sig says... it's a goner... I just want to lay off my truck for a little while and use it while it still starts. It has 148k on it... but they're 148,000 hard miles. Lots of sitting and being fired every now and again, then long distances w/o oil changes. Was used for a mail car at one point. Overall extremely abused. I can't blame it for not running right, I'd just like to use it to get me to school instead of my even more tired truck. All of my inlines are just falling apart from neglect... stupid previous owners(wanna talk horror stories, you should have seen under the valve cover of my 240... couldn't see the pushrods for the gunk built up... and it drove from Louisiana to here... *shivers*... )
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Old 12-08-2002, 09:11 PM
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dschumers dschumers is offline
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Have you tried adjusting the valves?
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  #7  
Old 12-08-2002, 09:18 PM
wallyghs wallyghs is offline
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it's a non adjustable hydraulic lifter motor... '81.

I have adjustable rockers and the pushrods for them... i WAS planning on doing a buildup for it... but when I saw the low cylinder pressure and the bottom end (it's scary) I decided otherwise. I may still bore it out and throw a new set of slugs in it later on down the road, but not right now.

I just can't figure out what would make that carb whistle like that at half throttle. The car decellerates and it starts whistling at half throttle. Open it up and it chugs but eventually picks up.. just like a motor that is waay overcarbed. I can't figure it out! I wonder if that offy intake is leaking at the adapter again.. Hmmm...
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  #8  
Old 12-09-2002, 02:46 AM
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dwc43 dwc43 is offline
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It's whistling because of those dead cylinders. They can't produce any vacuum to pull the air charge in and they are disturbing the natural air flow through the carb and engine making it whistle so to speak.
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  #9  
Old 12-09-2002, 09:02 PM
wallyghs wallyghs is offline
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NOT what I wanted to hear. Oh well... I replaced the lifter in the truck... it hadn't completely collapsed yet, was only knocking and making noise (thank God)... now it's all happy and hunky dorry... no metal in the pan either. Run it till she blows!
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  #10  
Old 12-10-2002, 12:39 AM
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dwc43 dwc43 is offline
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NO,NO,NO... run it till it knocks,rebiuld,go faster ... hehehe...
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  #11  
Old 12-12-2002, 03:04 PM
wallyghs wallyghs is offline
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No no.. run it till it blows... so I can justify that big block I've been drooling over
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  #12  
Old 12-12-2002, 05:14 PM
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dwc43 dwc43 is offline
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O.k. I stabd corrected. Let er blow then. They have a tendincy to do that when they run out of oil you know.
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