Nealio240z Posted July 17, 2007 Share Posted July 17, 2007 Could my HEI distributor be what is rev limiting me at 4500 rpm? I think it came out of a truck... If not what could be the problem... Quote Link to comment Share on other sites More sharing options...
HICKL Posted July 18, 2007 Share Posted July 18, 2007 What happens at 4500? Could be timing, mechanical advance not working, could be fuel, need more info on the setup and what is happening. Is it only under load that it limits? Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted July 19, 2007 Share Posted July 19, 2007 I think you're right, I've heard stock HEI dizzys max out around 4500rpm. Quote Link to comment Share on other sites More sharing options...
deja Posted July 19, 2007 Share Posted July 19, 2007 Everything you ever wanted to know about HEI and more. http://reviews.ebay.com/HEI-Ignitions-A-primer_W0QQugidZ10000000002053885?ssPageName=BUYGD:CAT:-1:SEARCH:3 Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 Vac advance is working. (holds suction) At 4500 rpm it hits the wall. just stops pulling and hovers there. Under no load it will rev to a full 6000 rpm. sbc 350 vortec heads, 8psi @97 gph fuel pump. q-jet carb (new) Iv been dealing with thias for some time, the only thing left to replace is the distributor... Quote Link to comment Share on other sites More sharing options...
deja Posted July 19, 2007 Share Posted July 19, 2007 Vac advance is working. (holds suction) At 4500 rpm it hits the wall. just stops pulling and hovers there. Under no load it will rev to a full 6000 rpm. sbc 350 vortec heads, 8psi @97 gph fuel pump. q-jet carb (new)Iv been dealing with thias for some time, the only thing left to replace is the distributor... How large of a wire to you have feeding the distributor? These things draw a lot of current. When I got my car the previuos owner had wired with about a 16 gage wire, not near big enough. I put a 10 gage on it and was shocked at the difference it made. Quote Link to comment Share on other sites More sharing options...
Pyro Posted July 19, 2007 Share Posted July 19, 2007 what in the initial timing and total timing? throttle is open all the way when your foot is on the floor? do you know for sure the secondarys are openning? A stock hei should pull easily to 6000 rpm. Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 throttle, timing, and secondarys. all in working order. Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 Deja, which wire are we talking about here? the positive that feeds the coil???? I tapped into the original coil feed wire under the battery. (the one that fed the straight 6 coil) was I supposto do something different? Im a little confused... Quote Link to comment Share on other sites More sharing options...
deja Posted July 19, 2007 Share Posted July 19, 2007 Deja, which wire are we talking about here? the positive that feeds the coil???? I tapped into the original coil feed wire under the battery. (the one that fed the straight 6 coil) was I supposto do something different? Im a little confused... There should be two connections on the distributor. One for the tach and one that says Batt. The Batt wire needs to be really large. If the stock wire is not then you need to trace it back to its source and run a bigger wire. That should be a ignition switched +12v. Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 Do I run the wire from the ignition switch to the coil? Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 Once the wire goes into the dist. cap it is reduced to a smaller gage. Do I need to make this wire larger also? Does the ground wire need to be larger also? Quote Link to comment Share on other sites More sharing options...
deja Posted July 19, 2007 Share Posted July 19, 2007 Do I run the wire from the ignition switch to the coil? Yes, but I'm confused now. My HEI did not use an external coil, it was build into the cap. Therfore there was no external ground wire. The ignition module was also inside the distributor. Like I said there was only one wire needed to run mine. Pictures of yours????? Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 wow im sorry... I dont have the car in front of me at this second... that black wire that i mistakenly refered to is my tach wire... oops So i need to run a 10 gage wire from my distributor to my ignition switch? and is that all... Is there a way I can bypass the key switch and go directly to the battery.. do I need to do anything to my fuse panel? Quote Link to comment Share on other sites More sharing options...
deja Posted July 19, 2007 Share Posted July 19, 2007 wow im sorry... I dont have the car in front of me at this second... that black wire that i mistakenly refered to is my tach wire... oops So i need to run a 10 gage wire from my distributor to my ignition switch? and is that all... Is there a way I can bypass the key switch and go directly to the battery.. do I need to do anything to my fuse panel? If you ran that directly to the battery your ignition would always have power and it would not last long and your car would be a snap to steal. Your fuse panel "should" be fine, as fine as any Datsun fuse panel is, LOL. Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 19, 2007 Author Share Posted July 19, 2007 Do you feel that this the problem... And am I correct in saying that the solution is to run a larger guage wire FROM the distributor TO the ignition switch and that is it, correct??? I would hat to have to buy a new dist. and find out that I have the same problem... Quote Link to comment Share on other sites More sharing options...
Teekass Posted July 19, 2007 Share Posted July 19, 2007 With the engine running, make sure you're getting at least +12volts at the distributor. HEI's can operate poorly when they don't get enough current? Are the spark plugs in good shape? Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted July 20, 2007 Author Share Posted July 20, 2007 Ill try that Teekass... the plugs and wires are all top of the line and new... Quote Link to comment Share on other sites More sharing options...
deja Posted July 20, 2007 Share Posted July 20, 2007 Do you feel that this the problem... And am I correct in saying that the solution is to run a larger guage wire FROM the distributor TO the ignition switch and that is it, correct??? I would hat to have to buy a new dist. and find out that I have the same problem... No I'm not saying that at all. Just telling you what I experianced with my HEI and an undersized wire. Your milage may differ. But even if you have to get a new distributor you NEED that large gage wire. Quote Link to comment Share on other sites More sharing options...
Teekass Posted July 20, 2007 Share Posted July 20, 2007 Hey Nealio, If you're looking to buy a new distributor I can vouch for the ones this person sells http://cgi.ebay.com/ebaymotors/CHEVY-V8-PROCOMP-HEI-DISTRIBUTOR-COIL-HIGH-PERFORMANCE_W0QQcmdZViewItemQQcategoryZ33690QQihZ017QQitemZ270144422112 . I bought one a couple months ago, and have turned it 6,000 rpm (no more til I get new valve springs) without a hickup. I'm sure there are better ones out there, but so far mine works great.......and I thought the price was right. I've only put around 20 miles on it though, so I can't say anything about it's longevity. Quote Link to comment Share on other sites More sharing options...
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