 2270(or so) Build |
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| yeahmag |
 Jan 8 2021, 12:47 PM
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#1
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Advanced Member  Group: Members Posts: 2,472 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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I'm starting to get the case(s) machined and inspected and parts ordered for my next generation engine. The car is mostly used for autocross.
78x96 96mm piston with 22mm wrist pin (stroker) 5.4" Type 1 Rod, 22mm wrist pin WebCam 86b/86c David Finch heads (from Len Hoffman many moons ago) 9.5:1 CR running on 91 octane pump gas CB Dry Sump (heavily modified) or Thorsten Piper dry sump pump Front mounted oil cooler There are a few crank options out there now: * DPR offset grind Type 1 journal * AA Performance Forged Type 1 journal * FAT Performance Forged Chevy journal I've read about a few 80mm DPR cranks breaking, so I was planning on staying under 80mm as I like the car to be able to rev. I was considering Chevy journals for ease of assembly, but the two cranks I've read about breaking were 80mm/Chevy journals. Is there any new information on cranks out there? Any input on the config? |
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| Dave_Darling |
Jan 9 2021, 07:02 PM
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#2
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914 Idiot Group: Members Posts: 15,305 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Is the 78 stroke big enough to require a reduced base-circle cam? I think I remember that's right around where you start to need that.
--DD |
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| Mark Henry |
Jan 9 2021, 08:48 PM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(Dave_Darling @ Jan 9 2021, 08:02 PM)  Is the 78 stroke big enough to require a reduced base-circle cam? I think I remember that's right around where you start to need that. --DD Both 78 T1 and the Chevy rod flavors need reduced base circle cam and mod rods. All because of one pesky cam lobe in the way. |
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| Montreal914 |
Jan 9 2021, 11:02 PM
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#4
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Senior Member Group: Members Posts: 1,978 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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QUOTE(Mark Henry @ Jan 9 2021, 06:48 PM) QUOTE(Dave_Darling @ Jan 9 2021, 08:02 PM) Is the 78 stroke big enough to require a reduced base-circle cam? I think I remember that's right around where you start to need that. --DD Both 78 T1 and the Chevy rod flavors need reduced base circle cam and mod rods. All because of one pesky cam lobe in the way. Reduced base-circle cam OK, but do these types of rods also need rework?  |
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Posts in this topic
yeahmag 2270(or so) Build Jan 8 2021, 12:47 PM
914werke Following. Aaron interested in your approach to dr... Jan 8 2021, 03:21 PM yeahmag I’ve been running the CB Pump successfully in my... Jan 8 2021, 03:35 PM Montreal914 Will definitely be following this thread. :popcor... Jan 8 2021, 08:35 PM wndsrfr FAT uses new forgings & will supply you with a... Jan 8 2021, 09:03 PM Alapone Definitely following this. Jan 8 2021, 09:57 PM yeahmag I have NOS JE’s and AA cast iron cylinders that ... Jan 8 2021, 10:17 PM
Montreal914
I have NOS JE’s and AA cast iron cylinders that... Jan 8 2021, 10:34 PM 914werke I used them on a 912E rebuild but that was only 20... Jan 8 2021, 11:05 PM groot I have a 80x96 with birals. It's only run on t... Jan 9 2021, 10:22 AM yeahmag
I have a 80x96 with birals. It's only run on ... Jan 9 2021, 12:01 PM Jack Standz
I'm starting to get the case(s) machined and ... Jan 9 2021, 11:15 AM Mark Henry Longevity you want the 78mm with T1 rod journals, ... Jan 9 2021, 02:08 PM groot AA crank, chevy journals... this is kind of a part... Jan 9 2021, 03:58 PM Mark Henry
[quote name='Mark Henry' post='2881686' date='Jan... Jan 10 2021, 07:59 AM groot Hmmmm... I didn't have much clearancing requir... Jan 10 2021, 10:04 AM Mark Henry
Hmmmm... I didn't have much clearancing requi... Jan 14 2021, 02:02 PM groot
It's the rods with that T4 combo and a big li... Jan 14 2021, 04:02 PM Blown59 Curiously... As a noob when it comes to T4 builds.... Jan 13 2021, 10:55 PM groot
Curiously... As a noob when it comes to T4 builds... Jan 14 2021, 03:56 PM Dave_Darling
Curiously... As a noob when it comes to T4 builds... Jan 14 2021, 07:08 PM Blown59
Curiously... As a noob when it comes to T4 build... Jan 17 2021, 03:38 PM Jake Raby
[quote name='Dave_Darling' post='2883027' date='J... Jan 18 2021, 11:45 PM Blown59
I sort of understand what youre saying... I get... Jan 19 2021, 10:31 AM yeahmag It's all about reducing the amount of case and... Jan 14 2021, 12:27 PM yeahmag Kevin,
What cam did you decide on for your 2316 b... Jan 14 2021, 03:58 PM groot Aaron. 163/86b... not trying to turn 7000+... I ha... Jan 14 2021, 04:04 PM Jake Raby Run a 1.065"BC and then clearance the rods as... Jan 19 2021, 01:07 PM Blown59
Run a 1.065"BC and then clearance the rods a... Jan 19 2021, 01:35 PM Mark Henry You're worrying about the wrong thing, the cra... Jan 20 2021, 06:53 AM Jake Raby
You're worrying about the wrong thing, the cr... Jan 20 2021, 07:57 AM Mark Henry You do realize high lift cams like the 163/86b req... Jan 20 2021, 08:09 AM Blown59
You do realize high lift cams like the 163/86b re... Jan 20 2021, 03:06 PM VaccaRabite
Everyone needs to learn one way or another. How ... Jan 21 2021, 08:28 AM Jake Raby Everything I know about all the Porsche engines I ... Jan 21 2021, 10:57 AM yeahmag Zach,
That's exactly how I ended up where I a... Jan 21 2021, 11:24 AM Jake Raby 10.8 is too high for a 163/86B on 93 octane unless... Jan 21 2021, 03:31 PM yeahmag Thanks, Jake. I'm really leaning towards the 8... Jan 21 2021, 03:37 PM Mark Henry
That's why I'm thinking of shooting for ... Jan 21 2021, 03:51 PM Mark Henry What heads?
With Len's heads you don't hav... Jan 21 2021, 03:48 PM yeahmag They are heads from Len, but not Len's heads. ... Jan 21 2021, 03:55 PM |
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