Pat all you gotta do is get rid of those piece of junk mahle pistons and put in some ross or arias pistons and you issu'es will likely go away.
Steel Pistons?
- Thread starter McRat
- Start date
Pat all you gotta do is get rid of those piece of junk mahle pistons and put in some ross or arias pistons and you issu'es will likely go away.
Until you get 100 quarter passes out of a set of pistons in a truck, your opinion on the life expectancy of Dmax pistons is kind of useless.
This is all i could get to load. Can you point out all the issue's? , 5.43 @ 130+ run :thumb:
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Thanks!:thumb:
So you have no problems at 5600rpm and 33 psi boost for <6 seconds.
And this is your basis for determining that Mahle pistons are garbage, and that you are a master engine builder.
Dial it up to 75psi and get back with us, eh?
So you have no problems at 5600rpm and 33 psi boost for <6 seconds.
And this is your basis for determining that Mahle pistons are garbage, and that you are a master engine builder.
Dial it up to 75psi and get back with us, eh?
Without the sarcasm:
For 1/4mi dragracing in heavy trucks, for sledpulling, for sustained high-power towing, and for land speed racing, the loads on the piston are far higher than anything you've personally dealt with, unless you've got a Dmax pickup that you are keeping quiet about.
And the Mahle's are surviving in those applications, but not indefinately. Much like factory rods, the OEM pistons are a known weak point. A piston that can survive for long periods of time for those application (like aftermarket rods can) would be a good thing.
Truth is, none of the high HP Dmax builds are showing acceptable lifespans IMO. Failures are pretty common. Just because your application hasn't shown issues isn't proof since the limited duration and short life you've seen. You simply don't have enough seat-time at 750rwhp+ to evaluate part life.
Until somebody runs steel pistons, we won't know how they do either. Perhaps they won't be a cure-all. But perhaps they will. Dmax'rs have been cracking and melting pistons for a very long time now. Arias have been in use now for ~4 years IIRC. Most the news about them is good news (your car isn't old enough to be good data), but there isn't a lot of them out there yet. Obviously I'm going to try and add to the knowledge base when I run them. Your evaluations of products is always the same:
"I have these parts, so they are best. Everything else sucks because if they were good, I would run them."
That logic might fly in the Dodge world, but Dmax folk tend to be a bit more scientific.
For 1/4mi dragracing in heavy trucks, for sledpulling, for sustained high-power towing, and for land speed racing, the loads on the piston are far higher than anything you've personally dealt with, unless you've got a Dmax pickup that you are keeping quiet about.
And the Mahle's are surviving in those applications, but not indefinately. Much like factory rods, the OEM pistons are a known weak point. A piston that can survive for long periods of time for those application (like aftermarket rods can) would be a good thing.
Truth is, none of the high HP Dmax builds are showing acceptable lifespans IMO. Failures are pretty common. Just because your application hasn't shown issues isn't proof since the limited duration and short life you've seen. You simply don't have enough seat-time at 750rwhp+ to evaluate part life.
Until somebody runs steel pistons, we won't know how they do either. Perhaps they won't be a cure-all. But perhaps they will. Dmax'rs have been cracking and melting pistons for a very long time now. Arias have been in use now for ~4 years IIRC. Most the news about them is good news (your car isn't old enough to be good data), but there isn't a lot of them out there yet. Obviously I'm going to try and add to the knowledge base when I run them. Your evaluations of products is always the same:
"I have these parts, so they are best. Everything else sucks because if they were good, I would run them."
That logic might fly in the Dodge world, but Dmax folk tend to be a bit more scientific.
So, you must be some miracle worker and tuner. Try a bunch of 1/4 mile passes first. Steel pistons would be better for longevity, and ability to withstand lots of heat cycles. Over the road trucks use steel pistons for this reason. I was at Shieds last year and spoke to the guys with commonrail cummins funnycar, and they have not anything but good things to say about the steel pistons; and you all know how commonrail cummins engines like to eat aluminum pistons up. My oppinion is that the little extra weight penalty would be well worth it, if I didnt have to pull the engine apart all the time due to melted pistons, worn out piston ring grooves, and lastly, I would be able to put miles on the engine without worry.
What's up with the lateral g's and acceleration g's? Was this on a dyno? Do you have any track logs/picture you can share?
Still didn't get to 5600 :baby: just picking, thanks for the post.
if you look at the cursor it at the end of the run, right when i shut it off. hence the low boost, accel and lateral g's
that run had over 2.5 g's of accel in first gear (after it recovered from it's bog of course) and just under 2 g's in second and still a g in third.
lateral g's on that run were over .5 g's on both sides of center lateral due to the rear end being so loose during the shifts
With all the tire spinning and tire shaking present, it did well.
The rpm and drive shaft lines should be smooth as glass when you have a good run with everything close to 100%
here is a vid of that run http://www.youtube.com/user/ngmdieselracing#p/a/u/1/kAHP6n53iFw
listen close you can hear the tires hoppin/shakin in first and second gear
here is another one you might enjoy watching, still tire spinning issue's up through third gear. It got much worse as the day went on.
http://www.youtube.com/user/ngmdieselracing#p/a/u/0/zJrUgFuXvtM
http://www.youtube.com/user/ngmdieselracing#p/a/u/0/zJrUgFuXvtM
Wade, So your program is in the very early stages of development from how it sounds.... is there plans for 1/4 mile racing this year seeing how you seem to have half the race sorted out. Would love to see those logs when this happens, nice log sheet and thanks for the share of data.
i've ran a few 1/4's last year in the 8's, only problem is that i shut off at the 1/8th mile and coasted throught the 1/4...
This year will be 1/8th mile first then 1/4 mile, looking for records.:cool2:
Testing to commence very soon.