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Search found 368 matches

by rebelrouser
Mon Oct 26, 2020 2:06 pm
Forum: Engine Tech
Topic: Lowering octane
Replies: 14
Views: 599

Re: Lowering octane

I would want to check the alcohol content of both fuels and do a specific gravity test. Then if the dyno had O2 sensors on it, look at the air fuel ratio. I have seen higher octane fuel make less power on several occasions, usually this is due to burn time differences, which could be made up for in ...
by rebelrouser
Thu Oct 22, 2020 10:31 pm
Forum: Engine Tech
Topic: New guy here, looking for some turbo ign timing help
Replies: 7
Views: 180

Re: New guy here, looking for some turbo ign timing help

I am not smart enough to tell you how to retard timing for boost mechanically. I don't see how it would work. The only way I could see it would work was if the vacuum advance diaphragm, under pressure would rotate the plate attached to the points or pickup coil, in the distributor and pull timing ou...
by rebelrouser
Thu Oct 22, 2020 12:36 pm
Forum: Engine Tech
Topic: New guy here, looking for some turbo ign timing help
Replies: 7
Views: 180

Re: New guy here, looking for some turbo ign timing help

I have a LA mopar with a procharger and a Fitech, buy an MSD distributor and program the timing curve. I trtied a differant aftermarket one and the Fitech did not like it. I assume you have the one that is capable. What I did was use performance trends engine software to plot a advance curve, I plot...
by rebelrouser
Mon Oct 19, 2020 11:45 pm
Forum: Engine Tech
Topic: Electrical system troubleshooting
Replies: 15
Views: 522

Re: Electrical system troubleshooting

your specification on parasitic draw is correct, 20 mAmps is very normal. When you watch the amperage drop after a few minutes, you are seeing the modules on the vehicle go to sleep. Lots of modules have keep alive memory, so that is why the draw never goes completely away, Keep alive memory is very...
by rebelrouser
Mon Oct 19, 2020 6:04 pm
Forum: Engine Tech
Topic: Jones Cams
Replies: 4
Views: 1015

Re: Jones Cams

finally got my old mopar together, main change was a Jones camshaft, finally got some good air and it ran two back to back passes 6.03 @ 113.8mph in the 1/8 mile, best before was a 6.10 @ 112mph
by rebelrouser
Mon Oct 19, 2020 9:36 am
Forum: Engine Tech
Topic: Epoxy For Blocks
Replies: 26
Views: 959

Re: Epoxy For Blocks

For repairs like what you have described, i use lock-n-stitch crack repair pins. No extra epoxy or sealer should be required. On extremely difficult repairs where there are small areas that can't be stitched, i pack problem area with 3M panel bond on both interior and exterior surfaces. Panel bond ...
by rebelrouser
Sun Oct 18, 2020 10:46 pm
Forum: Engine Tech
Topic: Epoxy For Blocks
Replies: 26
Views: 959

Re: Epoxy For Blocks

My experience with 440 mopar blocks that develop cracks after running them hard is, they are just about ready to blow the side out of the cylinder. been there seen that. If you have it apart trying to seal it up, take a close look at the block between the cam journal and the no. 2 main as well. BUT ...
by rebelrouser
Sun Oct 18, 2020 2:20 pm
Forum: Engine Tech
Topic: Brake in oil
Replies: 19
Views: 918

Re: Brake in oil

On my race engines I use a System one type oil filter, with an aluminum housing and a stainless steel mesh filter media. First you never need to buy a filter again, so it will pay for itself, second the housing is strong enough it will not burst, third, when doing an oil change it is easy to see wha...
by rebelrouser
Thu Oct 15, 2020 2:26 pm
Forum: Engine Tech
Topic: MSD 7al-2 to a MSD 8 box
Replies: 16
Views: 4281

Re: MSD 7al-2 to a MSD 8 box

Yes, another zombie reemerges, but the Similar Topics feature can be very useful in bringing 'filed and forgotten' info to the surface. Granted, asking: "So how did it run?" 12 years after a guy's planned strip test is unproductive, but much of such thread content is of ongoing value to members old...
by rebelrouser
Thu Oct 15, 2020 9:33 am
Forum: Engine Tech
Topic: Ignition timing after porting
Replies: 13
Views: 827

Re: Ignition timing after porting

not an expert, but never had to adjust timing much after porting a set of heads. what I usually notice, is an improvement in idle quality, and a lot more snappy when I crack the throttle. Even when I do a basically stock engine, the idle and throttle response is noticeable. I will also agree with th...
by rebelrouser
Wed Oct 14, 2020 3:51 pm
Forum: Engine Tech
Topic: power valve circuit myths
Replies: 35
Views: 1669

Re: power valve circuit myths

My experience with tunnel rams are, that your power valve change may help. But I would also try some different cams on the accelerator pumps. If you have a stumble in high gear, how far is the pedal down before you decide to stab it? The stock cams ramp may be almost used up by the time you need to ...
by rebelrouser
Wed Oct 14, 2020 9:02 am
Forum: Engine Tech
Topic: power valve circuit myths
Replies: 35
Views: 1669

Re: power valve circuit myths

The number on the power valve is supposed to be the opening point of the valve, if you have an 8.5 power valve and you hold 6 inches of vacuum at idle the power valve should be open. Your post reads that your power valve is not flowing? How did you determine it is not flowing? A blown power valve wi...
by rebelrouser
Sun Oct 11, 2020 11:41 pm
Forum: Engine Tech
Topic: Testing for a worn timing chain
Replies: 11
Views: 452

Re: Testing for a worn timing chain

10 degrees of movement was what we used for years, as a standard for chain replacement.
by rebelrouser
Thu Oct 08, 2020 10:45 am
Forum: Engine Tech
Topic: Modified oiling for stock-type BB Mopar pan
Replies: 11
Views: 259

Re: Modified oiling for stock-type BB Mopar pan

looks like some nice work. I have a 540 BBM, uses a world products aluminum block so it has priority oiling which helps a bunch. I used one of the mopar performance windage trays similar to the one you used, I simply cut out a section of the louvers and used teflon screen in their place. I never wen...
by rebelrouser
Wed Oct 07, 2020 6:13 pm
Forum: Engine Tech
Topic: L31 Vortec questions
Replies: 21
Views: 459

Re: L31 Vortec questions

Not really enough info, but. I will assume it has no codes active or in memory. Remember if you clear the codes they will not reset until you have driven it until all the monitors are set. Some scan tools will let you see the monitors and if they have been run. First thing I do is look at the short ...