540/B&M 250 Issue
09-19-2013, 03:18 PM
#21
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What type timing sets did you use, one that you can only install one way or has key-ways for advancing or retarding cam? Did you use a degree wheel and properly locate TDC 1 st?
09-19-2013, 06:47 PM
#22
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Could be a broken intake rocker, loose rocker not seated, leaving the intake valve closed
I have to agree with you. cigrocket
What is your cam firing order and how did you adjust the valves?
If you have swapped all components and checked timing advance, something is not sounding correct. Have you done any type of cylinder leak down, besides a compression test?
What is your cam firing order and how did you adjust the valves?
If you have swapped all components and checked timing advance, something is not sounding correct. Have you done any type of cylinder leak down, besides a compression test?
09-19-2013, 06:53 PM
#24
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09-19-2013, 06:59 PM
#25
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question for the op,why did you go with a cam with a non traditional firing order.
09-19-2013, 08:02 PM
#26
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Thread Starter
first off thanks to everyone for the input...
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
09-19-2013, 08:08 PM
#27
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im hoping bob will chime in on my cam question as im very interested in learning why he specked these cams.
09-19-2013, 08:11 PM
#28
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first off thanks to everyone for the input...
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
09-19-2013, 08:28 PM
#29
Registered
first off thanks to everyone for the input...
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
The top ends were spec'd by Bob M. Retro hydraulic rollers in Gen V blocks. Used his custom grinds from Cam motion, Morrell lifters, Isky 9005 springs, Manton pushrods, and Rollmaster adjustable timing sets. 088 heads with some pretty extensive head work. I had the heads flowed prior to spec'ing the cams and they were good to .700 The cams have 4* of advance ground into them and the bottom ends were built and cams installed by a very reputable local builder that I have worked with on several other projects. Cams installed at 0* due to the ground in advance and the builder said they were spot on. The bottom ends are Callies/Oliver/JE. The firing change order was done by Bob. The reason I tore these back down after about an hour was because of this issue. First thoughts were a vacuum leak but we could find nothing. When I reassembled the top ends I swaped the heads from the other engine and the issue stayed the same. I am thinking either bad distributor (timing) or wrong cam grind as the other engine runs great. Thanks again to everyone! keep the input coming.
09-19-2013, 08:34 PM
#30
Registered
I never chime in on any of these types of threads but am very curious as to what is causing the issue. You said a builder installed the cams and everything was on. With an off the shelf cam this seems to be standard procedure. My question is that since you have a cam with the firing order changed is it necessary to check every lobe to verify that it was ground accurately? Don't mean to hijack but curiosity got the better of me, hopefully some of the other guys will clarify. Good luck, they should push your .38 special very nicely!
