 Question to the braintrust for motor building |
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| Mikey914 |
 Nov 30 2021, 11:27 AM
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#1
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The rubber man  Group: Members Posts: 12,657 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None 
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Looking to make a larger motor (4) planning on a 2665, as I don;t really want to go over 103mm to make cooling easier.
The 80 crank is available for stock rods not the Chevy rods. It is my understanding that the Chevy option offers a significant upgrade to the strength. I'm tempted to do the stock. My question is : should I wait an indeterminate time for the crank with the Chevy rod option? What am I really loosing here? or is this just a must for the larger motors? My 1st engine build. |
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| Jack Standz |
Dec 1 2021, 01:14 PM
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#2
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Member Group: Members Posts: 272 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None |
Sounds like a very cool project. Best wishes with it. Similar to one we have planned.
Some things going into the 2.6 liter Type IV motor when time allows (so many projects to complete beforehand): Type 1 Journal on crank - hard to find, but available 18 months ago when started assembling parts. Stroke is 80mm (78mm stroke crank wasn't available). Nikasil cylinders with JE forged pistons, 102mm bore. Pistons are light, light lifters and valve train, along with lightened flywheel. Reducing reciprocating mass improves longevity, faster acceleration, more HP. Careful balancing very important. Better than H-Beam rods (lighter and stronger): https://www.thesamba.com/vw/classifieds/det....php?id=2342801 EMPI New Pro Series I-Beam Rods 5.5 Length with ARP 2000 5/16" Bolts in a VW Journal. These are lighter and stronger than the H-Beam Rods. Aluminum push Rods, custom length. Type 1 tool steel lifters (lighter than Type iv). Custom cam with extra duration on exhaust stroke (helps control motor heat). Lead time can be a project killer though. Keep compression low to aid with heat control. Initial spark setting,to be 14 degrees BTDC, with 28 all in...subject to tuning and optimization. Probably starting with carbs because they're so tunable and easy, especially since the car is already setup for them. Maybe later, like you, it'll have injection? As you already know, heat is an enemy in larger Type IV motors. So, stay focused on that (in addition to careful machining and assembly) and can't wait to see how she turns out! |
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Posts in this topic
Mikey914 Question to the braintrust for motor building Nov 30 2021, 11:27 AM
VaccaRabite What are your goals for the motor? Long drives, o... Nov 30 2021, 02:22 PM 914_teener
Looking to make a larger motor (4) planning on a ... Nov 30 2021, 04:07 PM
mepstein
Looking to make a larger motor (4) planning on a... Nov 30 2021, 04:17 PM
930cabman
Looking to make a larger motor (4) planning on a... Dec 1 2021, 01:38 PM 914werke Nickies? Nov 30 2021, 04:37 PM Superhawk996
My 1st engine build.
Seems like you're pro... Nov 30 2021, 04:55 PM Shivers 80 mm crank, wow lots of torque. In my bug days th... Nov 30 2021, 05:34 PM NARP74 I just went though this drill. Met a guy with all... Nov 30 2021, 05:55 PM Mikey914 Well my buddy Allen who is a factory trained mecha... Nov 30 2021, 08:04 PM BeatNavy
But if it works as planned will be a blueprint fo... Dec 1 2021, 07:15 AM Shivers
But if it works as planned will be a blueprint f... Dec 1 2021, 07:40 AM NARP74 Sounds like you are on the right track. Making it... Dec 1 2021, 12:06 AM Superhawk996 Other big bore considerations beyond thermal effec... Dec 1 2021, 07:31 AM Superhawk996 delete - duplicated post Dec 1 2021, 07:43 AM Mark Henry Toss the stock rod idea, they're heavy and a w... Dec 1 2021, 09:03 AM NARP74 Did anyone consider getting this project going aga... Dec 1 2021, 01:23 PM Mikey914 Thanks all,
This was the kind of feedback O was lo... Dec 1 2021, 02:19 PM 914_teener
Thanks all,
This was the kind of feedback O was l... Dec 1 2021, 02:35 PM Mark Henry
Thanks all,
This was the kind of feedback O was l... Dec 1 2021, 02:43 PM NARP74
Thanks all,
This was the kind of feedback O was ... Dec 1 2021, 05:04 PM barnfind9141972
[quote name='Mark Henry' post='2963984' date='Dec... Dec 1 2021, 09:39 PM 914_teener
[quote name='Mark Henry' post='2963984' date='De... Dec 1 2021, 09:48 PM Superhawk996
What I believe is that things aren't like th... Dec 2 2021, 07:02 AM Mark Henry
What I believe is that things aren't like t... Dec 2 2021, 08:42 AM mepstein
[quote name='Mark Henry' post='2963984' date='De... Dec 1 2021, 09:57 PM Superhawk996
There are probably reasons why the people go awa... Dec 2 2021, 07:06 AM mepstein
There are probably reasons why the people go aw... Dec 2 2021, 09:23 AM Mark Henry
[quote name='Superhawk996' post='2964134' date='D... Dec 2 2021, 09:45 AM 914werke It's easy to love these cars but hard to mak... Dec 1 2021, 10:47 PM wonkipop actually thats true about the last 5 years.
its h... Dec 2 2021, 01:36 AM Mikey914 Well, I know for sure this is a long term project.... Dec 2 2021, 03:05 AM NARP74
Well, I know for sure this is a long term project... Dec 2 2021, 12:06 PM Shivers Just a thought from a guy that has to do his own w... Dec 2 2021, 08:24 AM rhodyguy Budget in brand NEW heads. The case work. Rotating... Dec 2 2021, 08:54 AM 930cabman Not every customer is a good customer.
I always ... Dec 2 2021, 10:40 AM NARP74 Watched a TV show about Porsche bore score. They ... Dec 3 2021, 06:04 PM |
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