Refresh951's Hybrid Stroker - A Blown944 Design
06-21-2012, 06:59 PM
#46
Race Car
The rods are not the same. Just the same length. The factory journal diameter is 2.046, the new size is 1.77. That is the difference.
Yes the reciprocating assembly is much lighter.
My engine has already more than proven itself IMO. I've went to the track every week since its been installed and daily driven it as well. Right now it is making a little over 350 rwhp at 12psi using trap speed, which is a much better indicator of true power in comparison to a dyno. On a dyno it would probably show 375-400 rwhp.
Yes the reciprocating assembly is much lighter.
My engine has already more than proven itself IMO. I've went to the track every week since its been installed and daily driven it as well. Right now it is making a little over 350 rwhp at 12psi using trap speed, which is a much better indicator of true power in comparison to a dyno. On a dyno it would probably show 375-400 rwhp.
06-21-2012, 07:07 PM
#47
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The rods are not the same. Just the same length. The factory journal diameter is 2.046, the new size is 1.77. That is the difference.
Yes the reciprocating assembly is much lighter.
My engine has already more than proven itself IMO. I've went to the track every week since its been installed and daily driven it as well. Right now it is making a little over 350 rwhp at 12psi using trap speed, which is a much better indicator of true power in comparison to a dyno. On a dyno it would probably show 375-400 rwhp.
Yes the reciprocating assembly is much lighter.
My engine has already more than proven itself IMO. I've went to the track every week since its been installed and daily driven it as well. Right now it is making a little over 350 rwhp at 12psi using trap speed, which is a much better indicator of true power in comparison to a dyno. On a dyno it would probably show 375-400 rwhp.
Have even the 3L guys been able to make that much hp on only 12psi?
06-21-2012, 07:12 PM
#49
Race Car
06-21-2012, 07:17 PM
#50
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Sorry, I don't think I was clear with my question. I did not mean to make it sound as if I was asking about the stock porsche rods, but I misread you response and took it to mean that regardless of how much you ground off the journals, you could still use the same mitsu rod. I understand what you were saying now, I think. The mitsu rods being used are the same length as the porsche rods then?
06-21-2012, 08:17 PM
#53
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Yes - Includes sleeving.
06-21-2012, 09:03 PM
#54
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My wife said something to me tonight like "who are you?" The build has been a lot of fun but it is very time consuming. If you do something like this, do not think that it just buying some parts and slapping it together. The build requires a big commitment and a real focus. I have been to the machine shop no less than 10 times these past few weeks. There are dozens of ways to go wrong on something like this. My machinist has been crucial in the build. I have built a few Chevy motors but this build has required a lot more attention to detail.
Going through this process has made me appreciate Sid's development work even more. For him to pioneer this hybrid and be successful with his first build really says something about his abilities.
Going through this process has made me appreciate Sid's development work even more. For him to pioneer this hybrid and be successful with his first build really says something about his abilities.
06-21-2012, 10:08 PM
#56
I'd like to see how this does on a track with the crank ground down and losing that treated surface with those different bearings. Makes for an amazing street machine but DE type stuff is pretty popular with the 944 crowd.
06-21-2012, 10:26 PM
#57
Race Car
Look at the thread in the NA forum for Henk's car. The same guy does the cranks for this top level builder that also does them for MM. The process works and has been proven well before I did it. I just did it a little different.
06-21-2012, 10:41 PM
#58
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I will be doing a DE in the fall and we shall see. The 1/4 mile track has shown it can take the loads. If you keep oil temps reasonable (thus larger oil cooler) I see no reason this should not be reliable in a track environment. But time will tell...
06-21-2012, 10:52 PM
#59
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The smaller bearing surface, combined with the much better bearings, should both help improve bearing reliability.
06-26-2012, 08:27 PM
#60
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Was doing a test fit tonight, getting ready to install the crank and found the main bearings were damaged due to improper packaging. I have had the bearings for a few weeks but had not opened the box. I am still kicking myself for not checking these as soon as they arrived. Hopefully the vendor will over-night me a new set and then I can procede Thursday.
