Notices

Refresh951's Hybrid Stroker - A Blown944 Design

 
Old 06-21-2012, 06:59 PM
  #46  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
blown 944 is offline  
Old 06-21-2012, 07:07 PM
  #47  
toddk911
Drive-by provocation guy
Rennlist Member
 
toddk911's Avatar
 
Join Date: Apr 2002
Location: NAS PAX River, by way of Orlando
Posts: 10,439
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by blown 944 View Post
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.
How much of that do you think is displacement and how much is the head?

Have even the 3L guys been able to make that much hp on only 12psi?
toddk911 is offline  
Old 06-21-2012, 07:10 PM
  #48  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

The limit is dictated by the amount of material you can remove. Also there are interference issues.
blown 944 is offline  
Old 06-21-2012, 07:12 PM
  #49  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by toddk911 View Post
How much of that do you think is displacement and how much is the head?

Have even the 3L guys been able to make that much hp on only 12psi?
It's the displacement and some other ancillary things. The head is close to stock.

I'm sure they have. Probably more.
blown 944 is offline  
Old 06-21-2012, 07:17 PM
  #50  
Dougs951S
Super User
 
Dougs951S's Avatar
 
Join Date: Mar 2012
Location: Austin TX, drinking beer in the garage
Posts: 3,603
Likes: 0
Received 0 Likes on 0 Posts
Default

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?
Dougs951S is offline  
Old 06-21-2012, 07:26 PM
  #51  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

Very close. Within .006
blown 944 is offline  
Old 06-21-2012, 07:31 PM
  #52  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

Doug, to clear it up after reading your post again. The 3.1 uses a 3.0 crank to start with. Sorry about not reading that correctly.
blown 944 is offline  
Old 06-21-2012, 08:17 PM
  #53  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,331
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by V2Rocket_aka944 View Post
How much was the Mocal? Also, what brand of piston are you using? Summit sells a piston for the LS 6.0 (4.020"/102.11mm bore) made by Sealed Power for $26 each...
MoCal was $118 including shipping. Pistons are JE/SRP.

Originally Posted by m73m95 View Post
Does that $3,431 also include sleeving the block? That's an excellent price if it it does...
Yes - Includes sleeving.
refresh951 is offline  
Old 06-21-2012, 09:03 PM
  #54  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,331
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
refresh951 is offline  
Old 06-21-2012, 09:57 PM
  #55  
CyCloNe!
Addict
Rennlist Member
 
CyCloNe!'s Avatar
 
Join Date: Dec 2009
Location: Virginia Beach, VA 23464
Posts: 3,312
Received 3 Likes on 3 Posts
Default

^ you forgot to mention that he's a big hunk of sexy man-ness...
CyCloNe! is offline  
Old 06-21-2012, 10:08 PM
  #56  
Reimu
Super User
 
Reimu's Avatar
 
Join Date: Jun 2006
Location: NC Triad
Posts: 2,600
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
Reimu is offline  
Old 06-21-2012, 10:26 PM
  #57  
blown 944
Super User
 
blown 944's Avatar
 
Join Date: Jul 2007
Location: Firestone, Colorado
Posts: 4,826
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Reimu View Post
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.
I am not a liberty to say who, but the name is much more established than anyone posting on here. He has been doing this same process for a long time.

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.
blown 944 is offline  
Old 06-21-2012, 10:41 PM
  #58  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,331
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Reimu View Post
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.
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...
refresh951 is offline  
Old 06-21-2012, 10:52 PM
  #59  
Rogue_Ant
Addict
Rennlist Member

Rennlist
Small Business Partner

 
Rogue_Ant's Avatar
 
Join Date: May 2006
Location: Denver
Posts: 5,252
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Reimu View Post
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.
It isn't like the 944 has superb bearing reliability in factory-form...

The smaller bearing surface, combined with the much better bearings, should both help improve bearing reliability.
Rogue_Ant is offline  
Old 06-26-2012, 08:27 PM
  #60  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,331
Likes: 0
Received 0 Likes on 0 Posts
Default

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.



refresh951 is offline  

Thread Tools
Search this Thread
Quick Reply: Refresh951's Hybrid Stroker - A Blown944 Design


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: