Search results for query: *

  1. Mattax

    Engine dies, but turn the key off and back on it fires right back up

    And if it does start, same thing. Check the power going to the coil and going to the ECU. Ammeter will be no help 'cause current will be flowing from the alternator. Or rather, it ought to be! Then when it does you'll have a reference. The problem is either in one of the devices (ECU, Coil...
  2. Mattax

    Engine dies, but turn the key off and back on it fires right back up

    Not sure why you got pointed to this thread. The OP replaced the ECU and solved his problem. It sounds like you have changed the ECU? Lets think what we need to narrow the problem down. I assume you are checking no spark with a spark tester. On #1 or on the coil wire? if that is too...
  3. Mattax

    Green or Newer Coolant Type for Rebuild

    Because it suffers from the same deficiency of all organic inhibitors. They take time to buildup and become effective, and do not work well on systems that are 'open' to the atmosphere. Radiators and cores have become expensive.
  4. Mattax

    Green or Newer Coolant Type for Rebuild

    IF you are using no copper or soldered compomnents (heater and radiator mostly) AND set up an overflow and recovery system that keeps the air out, an OAT or H-OAT could last longer before it needs to be changed out. Otherwise stick with a conventional IAT antifreeze...
  5. Mattax

    Starter not engaging sometimes

    I doubt its the dust shield. Possibly the starter begining to go. Possibly a weak battery or poor connection. I'd start with removing and cleaning the battery terminals and checking the battery condition.
  6. Mattax

    Pop pop on exhaust side

    Thanks Dave. Excellent point. I did not watch the video through. I would guess outside air getting drawn into the exhaust system. Something not sealed would be a good investigation. Are these later 360 heads with the air ports unter the exhaust ports? I would think you would hear them...
  7. Mattax

    Cylinder head discussion 340 with stock above deck pistons

    Maybe too late, but as far as the AFR goes, those numbers are ballpark. To find out the best AFR for your combo, yes you'll have to make some tests at the track or the dyno. I realize that's a PIA. Go with a plan that involves one change at time. Be prepared to alter the follow up depending...
  8. Mattax

    Making power out of the 318

    Yea Too bad nobody told Chrysler that. :rolleyes:
  9. Mattax

    Making power out of the 318

    Another reason to build a 318 is because it fits in the rules. Or fits into the rules and cost-benefit better than other options - like a 305. @CPDave has covered that in his posts about the SVRA legal ZebraDart. That's 360 HP at the wheels and plenty of torque to come off the corners, and most...
  10. Mattax

    Making power out of the 318

    The car concept or theme had to be something stupid, crazy, or otherwise humorous. That may have slipped in more recent years.
  11. Mattax

    Making power out of the 318

    hassle for some, is for others fun ;) Also helped it meet the participation requirement for Lemons (scroll to bottom for videos) Side note: Carb tuning had guidance from a very knowledgable and helpful Tuner I highly respect.
  12. Mattax

    Making power out of the 318

    I thought the tunnel ram on the 318 was far more interesting. Just proves it can be done, and done well.
  13. Mattax

    Making power out of the 318

    I agree. A lot of people start there. Not all of us stay there. When I started going to the track, I quickly decided ET, MPH in the traps was how I wsa going to evaluate high performance. Reality over many autocrosses and of course years of street driving, evolved into much more interest in...
  14. Mattax

    Pop pop on exhaust side

    The idle port is restricted by the idle mix screw. Those let us do some fine adjustment to the idle mix, but they are only part of the story. The transfer slots also feed fuel at idle. The portion above the throttle blade also bleeds air into the mix, speeding the fuel along. The more the...
  15. Mattax

    Pop pop on exhaust side

    I don't have any idea what Holley is saying these days. The first steps are the ones I already provided and come in part from their former VP of Engineering Mike Urich. Fuel level first. Transfer slot check is needed because we can see its way too rich for conditions. That's also in his...
  16. Mattax

    Pop pop on exhaust side

    In reverse order of importance IMO I don't know about the later heads but with the earlier 273/318/340, no exhaust gasket is needed. Flat to flat. On the exhaust itself or with headers, I prefer thin so the clamping is more even and less likely to distort the flanges, BUT many headers in...
  17. Mattax

    Oil line plug/ low oil pressure on cold starts

    From the sources used in the articles linked below, the engineering studies did not find an increase in wear even at the lower concentrations tested. Even 800 ppm ZDDP antiwear package is better than these engine generally got when new. Once we get into high spring pressures for high lift...
  18. Mattax

    Oil line plug/ low oil pressure on cold starts

    Stock 318 with high rpm lifters. Gotta ask what is going on? If this 318 has been worked, then I don't know if those lifters are needed but as far ZDDP, I'd want a minimum of 800 ppm for stock cam, and maybe a bit higher, more like 1200 ppm if the valve spring pressures are high for a more...
  19. Mattax

    650 or 750 Edelbrock on 340

    Not many made. Even the Hot Rod magazine tests in '68-'69 were with the automatic cam that became the only cam. Why did they drop it? I have no idea. Cost vs. sales? Emissions? Technical Issues? My guess it was production and accounting reasons. No true replicas either. Ken at Oregon...
  20. Mattax

    650 or 750 Edelbrock on 340

    My point was the Edelbrock 1407 as manufactured is flawed. Its not fair to draw any conclusion about the design or whether the extra cfm/lower restriction is a demonstrateable advantage or disadvantage. If @Divenut wants to use the 750, then fix the flaws an it should be OK. Just looking at...
  21. Mattax

    Maybe I've learned a good lesson . . .

    yea yea yeah! Let's dive in! Or maybe the answer is simpler and we just need to take a swim in how a chassis dyno is used? Here's my thinking this morning. If this van has an automatic transmission (without a manual valve body) then the graph is showing both part throttle and full thottle...
  22. Mattax

    Maybe I've learned a good lesson . . .

    I agree - but would have thought that would have really clobbered the mid and high rpm.
  23. Mattax

    Maybe I've learned a good lesson . . .

    I just relistened. He said 'minor fluffing' of the entry and emphasized bowl work a couple times. And correct me if I'm wrong, I thought typical 360 came with 1.88 intake valves.
  24. Mattax

    Oil line plug/ low oil pressure on cold starts

    I've run Rhoads. They can be a little noisier, not ust at start up. A couple other companies made similar lifters. One, I forget which one, claimed to be quieter. The idea is they bleed down quicker to reduce duration and therefore overlap. As rpm increases the less they bleed down. Neat...
  25. Mattax

    Maybe I've learned a good lesson . . .

    That gets back to how effective are dynos in replicating the low rpm loads? If the chassis dyno is anything close to repeatable, then below intestate speeds, the van was less torquey and less responsive at full throttle with the ported heads, cam, and 4 bbl than it had been as a 2 bbl. The...
  26. Mattax

    Maybe I've learned a good lesson . . .

    Thanks! I missed that. I don't know if this is an issue of what they did or relates to the difficulties of running inertia dynos at lower rpms. Some differences he mentioned shouldn't have mattered (electric fan) Maybe I also missed it, I'm assuming the airgap rpm was the final intake along...
  27. Mattax

    Maybe I've learned a good lesson . . .

    Its interesting how much RWHP was lost below 3000 rpm with the final combo that Holdener put back into the van.
  28. Mattax

    Oil line plug/ low oil pressure on cold starts

    Oil viscosity at starting and even warm up is much much higher than at full operating termpertures. When the oil is thick, the pump can push harder, but the additional pressure is not getting more flow to the top...
  29. Mattax

    Oil line plug/ low oil pressure on cold starts

    Exactly. If anything, on a cold start one wants a lower 'W' grade and a lower pour point. Same for any time an engine is used for a lot of short drives where the oil doesn't get up to temperature. I'd also be looking in the used filter to see if the anti-drainback 'valve' was blown back or in...
  30. Mattax

    Does this prove David Vizard's 128 lsa formula ?

    Somewhat repeating myself here, but I've spent my dollars on DV and one has to assess both his strengths and his weaknesses of not just his understanding, but in the time and space available for his explanations. There's a reason one gets much more out of an HP Book than an SA Book. There are...
Back
Top