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XRV8 Gremlin

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Jmerican View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jmerican Quote  Post ReplyReply Direct Link To This Post Posted: Apr/30/2019 at 2:28pm
good stuff. My old Mallory dual point and the pro master coil did the job well. I made a cool bracket for the big oil filled coil in high school. The unilite and prestolite electronic have left me stranded. That said, I’m working on a 401 with original box still firing. Yikes. 


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Post Options Post Options   Thanks (1) Thanks(1)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: May/02/2019 at 8:07pm
Trying to be polite and answer questions put a curve into explanation for adding a higher performance super coil.

I was very content with the way the car was running before, but the lopey idle would make the spark plugs black and sooty due to over-rich condition at idle from long overlap cam.

So when I installed this super coil with MSD's .80 Ohm 'retro' ballast resistor, I was disappointed to find it run with lower idle and not a much crisp throttle response as before.

Then I tried AL795 ballast resistor with .633 Ohm rating and it ran better, but still not as good as stock coil...

Now trying the super coil with stock resistor wire and putting stock 9 volts to the coil = bang! there it is! The car has 'juice' now: idle went up, improved throttle response off idle and the air-fuel ratio gauge is clearly showing increased leaness.

Instant remedy was to turn each idle mixture screw out an additional half turn, but it's still showing a lean idle.

This is proof of power improvement because now the engine can burn a little more fuel and make more power around 1000 rpm = so the super coil install is not just an expensive ornament to decorate the engine compartment.

Testing so far shows no sign of coil overheating with stock wiring harness putting 9 volts to + terminal on coil.




Edited by amcenthusiast - May/02/2019 at 8:15pm
Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: May/14/2019 at 11:03pm
Hoping y'all will enjoy seeing pictures of these polished Rambler V8 adjustable rocker arms:



These were all rusty and cruddy looking prior to getting reworked.



These are not final buffed on a buffing wheel in order to become clear coated instead; for corrosion control (anti-rust) -whereas wax removal after buffing is not as easy as one might imagine. I believe the clear coat will last longer and be more maintenance free in the long run.



Notice XRV8 RP radiused rocker tips for use with higher lift custom ground camshaft:



Thank you AMC Forum for giving us a place to show and tell about our favorite American Motors products.


Edited by amcenthusiast - May/14/2019 at 11:12pm
Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: May/15/2019 at 9:34pm
Showing pictures of stock '56-'67 Rambler V8 adjustable rocker arms for comparison:



 
Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: May/15/2019 at 9:38pm
So far, I've been able to find three types of 'cup and ball' Rambler V8 pushrods for use with RV8 adjustable rocker arms (all same length):






Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: May/15/2019 at 9:41pm
Here's a few pics of the polished adjustable rocker arms installed on the 443 engine:






Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2019 at 6:10am
Hope they work out! Do note that in 66 Queen City AMC ran a 327 Ambassador in 3-4 NASCAR races. The "short" wheelbase car could only run on the small tracks and road courses. They didn't finish at least one race due to broken rocker arms. Because of the smaller size (Ford was running a 390...) they had to run the Ambo pretty darned hard, so you may never have an issue. I wonder if the polishing won't help though, by removing some potential stress areas.
Frank Swygert
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