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post #1 of 35 (permalink) Old 04-22-2013, 07:12 PM Thread Starter
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Cam overlap

What is cam overlap and how do you adjust with a thundermax auto tune


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post #2 of 35 (permalink) Old 04-22-2013, 10:33 PM
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Cam overlap is when both valves (intake & Exhaust) are open. Cain't help you with the Thundermax.


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post #3 of 35 (permalink) Old 04-23-2013, 01:06 AM
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The bottom line is you are not providing the correct info for anyone to help you!!!! As far as I can see it the problem is with your build and you are searching for answers. Your cam is what lift??? Your compression ratio is WHAT??? DO you have a correct base map?? The cam over lap has nothing to do with your problem the T-Max with the correct base map will auto tune your bike. You must have a mechanical problem somewhere or the incorrect base map. Did you have the intake leak??. If your cam is not a high compression cam the the bike won't run right and if your engine is not a high compression engine the the cam may not be compatible. I have a SE259E cam and 10:5 to1 pistons and it has a .579 lift and it works well with the build this is a compatible cam with a wood 777 which has .575 lift. Any cam that has .570 lift or above is a high compression cam. If your cam is high compression cam and you are only doing 9: to 1 or 9:5 to 1 compression then you may want to look into a different combination.


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post #4 of 35 (permalink) Old 04-23-2013, 01:14 AM Thread Starter
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Duh look at my sig half the questions you asked are there

S&S Super Stock 79cc Heads Ported Polished Oversize Valves S&S Easy Start Cams 570 Lift 2 Into 1 Jackpot Headers Jackpot Power Tube Muffler Stage 1 Air Box


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post #5 of 35 (permalink) Old 04-23-2013, 01:26 AM
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So you reply back being a wiseass and still don't answer the questions, I see your sig has things done to your bike but we don't know if it's up to date or you left something out. You still didn't tell us the specs on that cam or do you want us to look it up? You also didn't state if you have stock pistons or something other? Please don't take your frustration out on a helpful member here, this isn't HDFORUMS.com. You have a prob, we're here to help, but rememeber give us all the info, most people here use a mobile app on thier phone which doesnt display all the info, or didn't you think of that? Please be curtious and kind, and I'm almost positive one of us on here will have an answer, diagnosis, or atleast point you in the right direction to get your bike running good again.

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post #6 of 35 (permalink) Old 04-23-2013, 01:46 AM
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I understand that Joe and I understand your frustration. Is the cam a .570 lift and there is no mention of the compression ratio. Did You put in High Compression pistons? OR did you just do the heads with over sized valves ?? JUST because you did the heads doesn't mean that you have a higher compression. IS your cam compatible with your build?? Just because builders tell you that things will work it doesn't mean it will work These SOB's will tell you anything to sell you a product. For example the SOB that did my stage IV had no clue and told me that I need to put a 58mm Throttle Body on and bigger injectors.

Then the SOB couldn't tune the bike on his dyno And I ended up getting a T-Max and it fixed most of my problems but I still had to tweak a few things and I also change out the 58mm TB and put the stock TB back on but to avoid changing the base map I still used the 5.3 grams per second injectors and the T-Max made all the adjustments needed.

The T-Max is a very good unit IMO and if it can't tune your bike then there may be other issues that may need to be addressed.

Did you check out the PDF on timing adjustment I posted on one of your threads


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post #7 of 35 (permalink) Old 04-23-2013, 03:15 AM
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Exactly, you have to imagine us all as idiots, we know nothing of your current build and I know it's cumbersom to keep typing all the same info again and again but we don't own your bike. Your builder may have no idea on to setup an engine package, or plain and simple something could be wrong as malfunction or just not the right part. Hell I've had the Dealership keep my bike for over 2 weeks for an engine stutter issue and they kept telling me it was my pipes, when I got it home I diagnosed it myself with a twisted to all hell fuel inj. wire that caused all my prob's!

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post #8 of 35 (permalink) Old 04-23-2013, 04:28 AM
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Quote:
Originally Posted by SMOKENJOE View Post
What is cam overlap and how do you adjust with a thundermax auto tune
Cam overlap is a mechanical design feature and is not adjustable by any means whatsoever after engine assembly is completed (with possible exceptions being extremely sophisticated pure race-only engines and dual overhead cams).

It is defined in degrees of crankshaft rotation while both the intake and the exhaust valves are being held open. The idea is to let the most recent outgoing exhaust pulse (a primary feature of "tuned exhaust" systems) help suck in the fresh incoming A/F mixture.

The amount of overlap is defined by the cam designer and is an element of the machining process - a fixed value, forever. It's a totally mechanical function and no ECM or "tuner" out there can change it.

Come on guys... already been said:

Quote:
Originally Posted by rc_chico View Post
Cam overlap is when both valves (intake & Exhaust) are open. Cain't help you with the Thundermax.

Bring 'em home or send us back!!

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post #9 of 35 (permalink) Old 04-23-2013, 07:41 AM
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lift has nothing to do with compression requirments(duration and opening & closing specs determines what compression it should be set at),the .570 likes to be set @ 9.8-1 (10.0 max),second overlap is what it is and cant be "adjusted" with your T-MAX.a S&S .570 is a mild cam and not really seeing why your haveing a problem tuning it.we use ALOT of them and are tuned with no problems
post #10 of 35 (permalink) Old 04-23-2013, 10:34 AM
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Quote:
Originally Posted by prodrag1320 View Post
lift has nothing to do with compression requirments(duration and opening & closing specs determines what compression it should be set at),the .570 likes to be set @ 9.8-1 (10.0 max),second overlap is what it is and cant be "adjusted" with your T-MAX.a S&S .570 is a mild cam and not really seeing why your haveing a problem tuning it.we use ALOT of them and are tuned with no problems
Excellent info prodrag and completely concur. Thanks for filling in the gaps I left open.

ETA: I honestly have no clue about the T-Max though. I would assume that, being billed as "automated", then ignition control is an included feature and self-adjusted on-the-fly somehow. Anyone know for sure?

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Last edited by 4getNo1; 04-23-2013 at 11:37 AM.
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