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spark lead for the 195.6 OHV... |
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Wrambler
AMC Addicted Joined: Jul/02/2007 Location: West Virginia Status: Offline Points: 4197 |
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You tweak the error by traveling more or less than the actual mile, but my Sport Comp is basically the same hit or miss situation based on 2 mile distance. I'm unhappy with it's attitude, I'd like to go to something different. But then I mess with the look of the rest of the dash. I'm going to try and run it off the ABS setup in the 8.8" once I get it in. The existing sensor in the trans sits directly above the exhaust and I hope it is the sensor acting up again.
This week I have to go stomp around in the woods and try to shoot, Bambi's dad, mom, or maybe just Bambi. That's what having a son in wildlife and fisheries in college does to you. |
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Wrambler
69 AMC Rambler 4.0L, 5 speed 2015 Grand Cherokee Limited 2019 Chrysler 300 |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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the 195.6 OHV doesn't ping in the way that the 232 does; its almost silent, which is a little scary. i advanced the map in areas, a degree at a time, and got it where under heavy load it "sounded funny" and "felt flat" --- that's pinging. backing it off 2 degrees made it feel lively again, so that's my working definition of "ping". the ping sound, when you can hear it, is very dull and suppressed. heavy pistons? the awful wedge combustion chamber? dunno.
basically, at 2700 rpm, 60 Kpa manifold, it's happy with 36 degrees advance. the old crap distro did at best 24 degrees advance. no vailable distributor will give this motor what it wants. power and mileage and sound and coolant temp are all great. when i finish tweaking the map in the next few weeks i'll update the web page and post a link. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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One reason it doesn't make much sound when pinning is because of the thick castings. The cylinder walls are about 1/4" thick, not like the much thinner modern castings (64+ for thinwall cast blocks and such, couldn't cast thin before then!). Takes a lot to transfer sound through all that thick cast iron! The noise of the solid lifter valvetrain masks some of the pinging as well.
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Frank Swygert
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nickleone
AMC Addicted Joined: Oct/04/2008 Location: westminster co Status: Offline Points: 1429 |
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Tom,
Your not the only one working on a 196. My partner and I thought it would be too easy to drop the 401 into the 62 Classic.LOL Rebuilt 196 with 60 over pistons and a reground cam (don't have specs here). My partner built a new manifold plate for mounting 3 single barrel carbs and is working on progressive linkage. Waiting for some warm weather this Dec to drop it in the car. We have the adaptor for a T5 but will run the car without for a few months and do a swap late next year. Have you updated the roadster web page recently? Nick |
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nick
401 71 Gremlin pro rally car sold 390 V8 SX/4 pro rally car sold 1962 Classic SW T5 4 wheel disc brakes |
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9048 |
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Nick,
Just curious. Where did you get the 90-over pistons and did you have the block sonic tested before boring to that size? I have a freshly bored (to .060 over) that still has just a shadow of the old rust. If I build it I was planning not to go .080 or .090 over unless pistons were readily available. Joe
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Happiness is making something out of nothing.
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nickleone
AMC Addicted Joined: Oct/04/2008 Location: westminster co Status: Offline Points: 1429 |
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I fat fingered the 90. Corrected it to 60 over after original post.
60 over piston were a Ebay buy. About $50 at the time. Nicm |
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nick
401 71 Gremlin pro rally car sold 390 V8 SX/4 pro rally car sold 1962 Classic SW T5 4 wheel disc brakes |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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nice! i DEMAND pics! lol it's a fun and forgiving engine in a lot of ways. i wish the combustion chamber wasn't so 19th century.
i can envision the day when i'm forced to ditch this old T-96. it's truly awful. seriously, it's a full second to shift even 2 to 3. the synchro is a mere suggestion. i know exactly how weak it is -- i sheared teeth off 1st on a newly built T-96+OD in my old '63 classic wagon behind a 232. admittedly it was on a crazy-steep San Francisco hill, but teeth-shearing?! its undersized EVEN for the 1956 OHV! probably "fine" for the flathead. plus mine leaks out the tailshaft seal, since they're unobtanium and have a kludgey retrofit. i need to get a T5 and adapter from Modern Driveline. i hope he will still talk to me after i sort of talked him into making them and then never bougt one ~_~ about a week ago i think... my laptop died, had to replace, so that delayed work on everything. i have a lot of pics that didn't fit in the scheme so ill put those up on an "other pics" page. "soon". Edited by tomj - Dec/06/2014 at 11:37pm |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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Well, in the chamber designs defense, it's mostly the way it is because of the conversion from the L-head. Block height and such is the same, and the L-head used flat-top pistons. So to get good compression and have room for the overhead valves, a pent roof design was necessary. Hate those matching domed pistons -- makes it hard to get a piston that works unless you want something like 6:1 compression (a flat top in place of the dome might be more like 5:1...). Or course that and about 10 psi of boost...
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Frank Swygert
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DocCreer
AMC Addicted Joined: Oct/03/2009 Location: Portland Oregon Status: Offline Points: 1568 |
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How is the Roadster?Any pics?
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61 American
82 eagle limited |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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OK, so i'm slow... i have been doing some thorough testing and experimentation of spark timing for my 195.6 OHV. in my experience, you simply cannot get satisfactory spark timing for this engine with the distributor -- any distributor. i had modified mine to allow for an additional 11 degrees of advance, but even that isn't enough -- and the curve is difficult if not impossible to get right. worse, there are no NEW distros available, they're all worn out. Distributor-hack link: http://worldpowersystems.com/AMC/195.6OHV/Distributor/index.html
i've been running a 2009 Ford EDIS-6 system for years, and the improvement is night vs. day. absolutely superior to any distributor (195.6 or not). there is zero (0) timing jitter - none at all. you can literally hear the difference immediately, at idle and at 4000 rpm. EDIS hack link: http://worldpowersystems.com/AMC/195.6OHV/EDIS%20ignition/index.html the table below is what i'm running successfully now. my American Roadster is light (2500 lbs with gas and driver) so it probably likes a bit more than a stock American. but the "curve" is most important. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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