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Re: No low end Torque on 383 Dart
[Re: 68 Dart GTS]
#427803
02/25/10 12:50 AM
02/25/10 12:50 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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It's a good thing the chebby/furd guys dont have our dedication and support system  . when you find it be sure and post it
live every 24 hour block of time like it's your last day on earth
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Re: Would the XE256 cause an E58 to have low vacuum?
[Re: 68 Dart GTS]
#427804
02/25/10 11:16 AM
02/25/10 11:16 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
approx. 9.5-1 to 10-1 comp. 12 degrees intl. and 14 vac.
is that verified or what the pistons are supposed to give?
KB flat tops at 0 deck, steel shim head gasket, and OEM 906 heads usually only yields 9:1....if they are stock type replacement pistons in the hole, you're probably in the low-mid 8's at best.
what's your cranking compression in PSI?
initial with that cam, assuming actual compression is in the 8's, I'd run about 18-20. if your cranking compression comes in low (under 150), I'd seriously consider dropping in cam size a bit (lunati voodoo 60302 is what I'd pick), or opening up the motor and advancing installed centerline of the cam 4-6 degrees to close the intake valve sooner to gain cranking compression. the torker is also a mediocre intake...especially if you're looking for "street" performance...
http://hotrod.automotive.com/62106/hrdp-0712-mopar-intake-manifold-comparo/edelbrock-383.html
check out the torque figures at 3000 RPM...it's down 25 lb-ft from a weiand action plus, or eddie performer, and most likely a stock intake.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Would the XE256 cause an E58 to have low vacuum? update
[Re: RobX4406]
#427806
02/25/10 04:53 PM
02/25/10 04:53 PM
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Joined: Jan 2003
Posts: 6,840
The Swamp
Sixpak
master
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master
Joined: Jan 2003
Posts: 6,840
The Swamp
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Quote:
Something is VERY wrong. Did you fix or check the balancer issue?
There is NO REASON that camshaft shouldn't idle at 750-850 rpm with a 50-75 rpm drop in gear.
If the timing is correct, I bet there's a vacuum leak somewhere.
Start with the BASICS - make sure the timing mark on the balancer is not off.
Do you know how to use a positive stop tool against the piston to determine if the timing marks are off?
If the balancer mark is on, is the oil pump drive properly indexed to the # 1 cylinder when the motor is at TDC?
Where is the cam installed - straight up, advanced, or retarded?
Do you have adjustable rockers - if so, are they adjusted properly?
Can you block off all other vacuum hoses and outlets on the manifold except for the vacuum gauge and the vacuum advance for the car, to eliminate all other sources of vacuum leaks?
Can you borrow a known good working carb from someone to test with?
Has anyone fooled with the advance curve or changed the springs or weights in the distributor? Does the vac advance unit have a leak? Does it hold a vacuum?
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