Rebuilt engine, no compression, spitting gas, help
#1882386
07/31/15 06:19 PM
07/31/15 06:19 PM
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Joined: Mar 2005
Posts: 170 Western., NY
sco440
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OP
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Joined: Mar 2005
Posts: 170
Western., NY
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Newly rebuilt 440. Went to start for the first time and it is not building up any compression, is spitting gas through the Eddy carb. It was completely rebuilt all new parts basically to stock. Is this a camshaft issue? THX
'72 Road Runner '72 Dart Swinger 340 '12 Challenger R/T
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: sco440]
#1882396
07/31/15 06:29 PM
07/31/15 06:29 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Newly rebuilt 440. Went to start for the first time and it is not building up any compression, is spitting gas through the Eddy carb. It was completely rebuilt all new parts basically to stock. Is this a camshaft issue? THX Lifter pre load, did you check it?
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: sco440]
#1882406
07/31/15 06:40 PM
07/31/15 06:40 PM
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Joined: Aug 2013
Posts: 152 usa
smos001
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usa
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: stumpy]
#1882528
07/31/15 10:38 PM
07/31/15 10:38 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would regoop the cam. set dampener at 15 BTDC. check the lobes when you regoop to see if you are on #1 or #6 compression & clock the rotor accordingly. turn housing so magnet is dead even with the tooth. make a mark on the dampener 2&7/32" CW from the TDC slit & have your dist man set it to that when it fires (vac adv capped). carb bowls filled. batt charged. fan in front of rad. front end jacked up. thermostat OUT. read "breakin secrets" at www.mototuneusa.com goose the throttle many many times during the 25 minute breakin. during mockup confirm lifters are free to rotate (hughes engines procedure).
live every 24 hour block of time like it's your last day on earth
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: sco440]
#1882635
08/01/15 01:29 AM
08/01/15 01:29 AM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Who rebuilt it? If you did the build did you install the cam with the dots on the gears or did you install the cam and and degree it? If with the dots on the gears did you aligned the crank gear dot out under the teeth or the one on the inside above the crankshaft key? If the one above the key you need to use the one on the outer edge of the crank gear. If you didn't do the build call the one who did and tell them to come fix it Let us know what youy find and do, it will help a lot of others on here also
Last edited by Cab_Burge; 08/01/15 06:14 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: sco440]
#1882910
08/01/15 03:38 PM
08/01/15 03:38 PM
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Joined: Mar 2005
Posts: 170 Western., NY
sco440
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OP
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Posts: 170
Western., NY
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I have some compression maybe 50 lbs not enough for it to run.. I think the engine builder didn't perfectly line up the dots on the cam and crank sprockets when he put the timing chain on.
'72 Road Runner '72 Dart Swinger 340 '12 Challenger R/T
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: sco440]
#1882994
08/01/15 06:18 PM
08/01/15 06:18 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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To make it spit gas up out of the carb while cranking on the starter the valves have to be opened The cam is out of time, have the builder correct it or maybe have someone who knows more than your builder help you reinstall the timing gears and align the dots proeprly I think you should really degree the cam for the best performance also
Last edited by Cab_Burge; 08/01/15 06:22 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: Cab_Burge]
#1883267
08/02/15 01:45 AM
08/02/15 01:45 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Cab said, if it is dot to dot (correct dots that is!) it'd still have good compression even with the dist 180 out. With a multiple keyway gearset its confused some to line up the cam gear wrong. inner marks are for adv/ret/straight up phasing. outer marks (closer to perimeter) are for dot to dot
live every 24 hour block of time like it's your last day on earth
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Re: Rebuilt engine, no compression, spitting gas, help
[Re: RapidRobert]
#1883307
08/02/15 02:41 AM
08/02/15 02:41 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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Marysville, O-H-I-O
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If the wrong dot was used in 'dot to dot' the cam can be as much as 30 degrees advanced/retarded. Recipie for Pistons to hit valves. DAMHIK.
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