Re: Losing my Mind, 340 Six pack wont pull
[Re: stroked470]
#2325436
06/22/17 09:54 PM
06/22/17 09:54 PM
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I ran into that years ago. I worked at a garage and a local guy had a Ramcharger that he put a 440 in. He had the machine shop build the engine and he put it in. It done the exact same thing. Sounded good at idle and would rev like crazy. He changed everything atleast 2 times and finally give up. I pulled the timing cover and the timing chain was off 2 teeth. I lined it up and it would pull to 6000rpm no problem. Before it would go to 3000 and stop. Even holding it to the floor it would set at 3000 all day long. Ill be pulling the timing cover off tonight since i see comp is way down all around
73 Duster 340 a518 6pack
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325467
06/22/17 11:00 PM
06/22/17 11:00 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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post what it ends up being.
live every 24 hour block of time like it's your last day on earth
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325501
06/22/17 11:45 PM
06/22/17 11:45 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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What's interesting about the "it won't rev because of the cam timing" hypothesis is......modern cars with VVT can move the cams around 50 degrees.......and they rev just fine.
I agree the 90psi cranking pressure needs looking into.
I thought the vacuum reading test was a check for plugged catalytic converters(or other exhaust restrictions).
I'll be interested to see what's found when the timing cover is removed.
If the cam is retarded 2.5 teeth(35 deg) as someone mentioned, I would think there's a good possibility of some bent exhaust valves.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325515
06/23/17 12:14 AM
06/23/17 12:14 AM
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soo i installed the cam straight up and didnt even look at the damn cam card.... http://www.lunatipower.com/CamSpecCard.aspx?partNumber=60403By the looks of it i should advance it 4 degrees Been a long ass time since i delt with a gasser
73 Duster 340 a518 6pack
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325520
06/23/17 12:27 AM
06/23/17 12:27 AM
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Joined: Sep 2014
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madscientist
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If you just lined up the dots it SHOULD be 4*'s ahead.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Losing my Mind, 340 Six pack wont pull
[Re: madscientist]
#2325535
06/23/17 12:55 AM
06/23/17 12:55 AM
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If you just lined up the dots it SHOULD be 4*'s ahead. so by right's i am 4deg advanced. i should be using the -4 to be straight up. correct?
73 Duster 340 a518 6pack
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325549
06/23/17 01:16 AM
06/23/17 01:16 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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so by right's i am 4deg advanced. i should be using the -4 to be straight up. correct? that would likely get you "close" to straight up. I don't think that is the problem tho especially since advancing the cam would bump the cranking compression #. Keep digging, the 80 lbs is what Sherlock Holmes would call a serious clue.
live every 24 hour block of time like it's your last day on earth
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325551
06/23/17 01:19 AM
06/23/17 01:19 AM
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If you just lined up the dots it SHOULD be 4*'s ahead. so by right's i am 4deg advanced. i should be using the -4 to be straight up. correct? Most cams are ground with 4* advance into them so if you line up the dots the cam will be installed where the cam grinder wanted it. Dot to dot SHOULD be in at 106 where the card says. If you retard it 4 you SHOULD be at 110. The only way to know for sure where it is is by degreeing the cam in. I've seen some weird stuff over the years. You could have some tolerance stack up and have it be way off. But I'd bet it's pretty close to 106. You just need to verify that.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Losing my Mind, 340 Six pack wont pull
[Re: mopar dave]
#2325786
06/23/17 03:51 PM
06/23/17 03:51 PM
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dogdays
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You could use the split overlap method to see if your lifters are about equally off the base circle at TDC at end of exhaust stroke. It's quick and dirty.
I've had a sticking mechanical advance do something similar. R.
Last edited by dogdays; 06/23/17 03:53 PM.
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325864
06/23/17 07:17 PM
06/23/17 07:17 PM
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I feel like a moron now..... Checked the timing marks and i thought they were good. Had my brother look at it and pointed out i had lined it up with the key way and not the actual mark.... Put it on right and 140psi cold. Have the timing cover to toss on but ill report back in the morning.
73 Duster 340 a518 6pack
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325866
06/23/17 07:24 PM
06/23/17 07:24 PM
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Glad you found it. You're not the first to do that. You certainly won't be the last.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325873
06/23/17 07:43 PM
06/23/17 07:43 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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So, 2 1/2 teeth off........ 35deg.
I'd be doing a leak down test.
With the key straight up and the top gear dot straight down, the cam is advanced 2 1/2 teeth. This almost always results in the intake valves running into the pistons...... Unless the valve pockets are really deep and/or the cam is really small.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2325880
06/23/17 07:58 PM
06/23/17 07:58 PM
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JAKE68
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So that means you still have not degreed it in? if degreed from the get go this would not have happened. Just saying.
Last edited by JAKE68; 06/23/17 07:58 PM.
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Re: Losing my Mind, 340 Six pack wont pull
[Re: Scat]
#2326139
06/24/17 03:57 PM
06/24/17 03:57 PM
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It rips like a scaulded cat now! The cam isnt big by anymeans but everything was fine as for leak down and comp. Guess i got lucky. The old tired motor only has to last till i get the gen3 hemi built for it. Thanks for the advice guys
73 Duster 340 a518 6pack
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