Biggest Crank in a Type4
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- Posts: 4
- Joined: Fri Nov 06, 2009 1:35 am
Biggest Crank in a Type4
What is the longest stroke to fit in a Type4 case?
- bj
- Posts: 1156
- Joined: Sat Feb 08, 2003 12:01 am
Re: Biggest Crank in a Type4
this has a "depends" answer:
how big is your cam?
what journals do you want to use?
how much clearancing do you want to do?
i am running a 80mm stroke, 2.0l journals, reduced base circle cam with a .500" lift. the case and cylinders needed some clearancing.
there are others running bigger strokes here, but more work is involved.
search for type4unleased. he has built some crazy motors and is a nice guy to boot.
bj
how big is your cam?
what journals do you want to use?
how much clearancing do you want to do?
i am running a 80mm stroke, 2.0l journals, reduced base circle cam with a .500" lift. the case and cylinders needed some clearancing.
there are others running bigger strokes here, but more work is involved.
search for type4unleased. he has built some crazy motors and is a nice guy to boot.
bj
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- Posts: 4
- Joined: Fri Nov 06, 2009 1:35 am
Re: Biggest Crank in a Type4
Biggest ever tried?
Want some Crazy stuff to build!!!...
Want some Crazy stuff to build!!!...
- Unkl Ian
- Posts: 872
- Joined: Sat May 25, 2002 12:01 am
Re: Biggest Crank in a Type4
Clearing becomes a problem with large strokes,
since the cam lobs line up with the rods.
Jake went pretty big with his 3 liters, and was working on something bigger.
Numbers will be in his old forum here.
since the cam lobs line up with the rods.
Jake went pretty big with his 3 liters, and was working on something bigger.
Numbers will be in his old forum here.
- wrenchnride247
- Posts: 74
- Joined: Sun Dec 04, 2005 9:03 am
Re: Biggest Crank in a Type4
86mm is about it...
- dstar5000
- Posts: 4555
- Joined: Tue Feb 12, 2002 12:01 am
Re: Biggest Crank in a Type4
111X90=3484cc is max physically.
This will require removing the oil cooler mount as well as the other various mods...
Don
This will require removing the oil cooler mount as well as the other various mods...
Don
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Re: Biggest Crank in a Type4
I have seen 90mm, but could only be done with a very small rod journal, which usually weakens the crank.
With extremely good ($$) materials and light weight reciprocing weight parts (more $$), this stroke did make a certain auto-cross-buggy european champion in their class back then.
So it can be done, but the effort and costs will rise exponentially, providing you(r builder) even know how to, to begin with...
With extremely good ($$) materials and light weight reciprocing weight parts (more $$), this stroke did make a certain auto-cross-buggy european champion in their class back then.
So it can be done, but the effort and costs will rise exponentially, providing you(r builder) even know how to, to begin with...
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- typ4
- Posts: 551
- Joined: Sat Mar 01, 2008 9:46 pm
Re: Biggest Crank in a Type4
Hey dstar, that made my ears perk up. 111mm cyls, do tell.
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Re: Biggest Crank in a Type4
?? the 90mm is not my engine if thats what your asking?typ4 wrote:
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
- typ4
- Posts: 551
- Joined: Sat Mar 01, 2008 9:46 pm
Re: Biggest Crank in a Type4
Wally wrote:?? the 90mm is not my engine if thats what your asking?typ4 wrote:
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
Nope, not what I was asking, just curious about turbo layout, injection system and such. Heads?
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Re: Biggest Crank in a Type4
Ah, its all in here mate:typ4 wrote:Wally wrote:?? the 90mm is not my engine if thats what your asking?typ4 wrote:
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
Nope, not what I was asking, just curious about turbo layout, injection system and such. Heads?
http://www.shoptalkforums.com/viewtopic ... 1&t=115287
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- dstar5000
- Posts: 4555
- Joined: Tue Feb 12, 2002 12:01 am
Re: Biggest Crank in a Type4
lycomingtyp4 wrote:Hey dstar, that made my ears perk up. 111mm cyls, do tell.
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
$$$
ebay.com, under airplane parts....
DOn
- Type 4 Unleashed
- Moderator
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Re: Biggest Crank in a Type4
They are 111.125mm, Lycoming Aircraft cylinders.typ4 wrote:Hey dstar, that made my ears perk up. 111mm cyls, do tell.
Wally do you have some pics of your setup, I am doing another engine for the wifes rail and I like your HP numbers.
- Type 4 Unleashed
- Moderator
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Re: Biggest Crank in a Type4
I know of 2 90mm cranks done by EMW from SCAT 86mm cranks, with Chevy 2.0"-50.8mm jrl's and are ran with the Cunningham rods.Wally wrote:I have seen 90mm, but could only be done with a very small rod journal, which usually weakens the crank.
With extremely good ($$) materials and light weight reciprocity weight parts (more $$), this stroke did make a certain auto-cross-buggy european champion in their class back then.
So it can be done, but the effort and costs will rise exponentially, providing you(r builder) even know how to, to begin with...
A smaller jrl say a 46mm rabbit with a rods outer dia that's been reduced in proportion with the jrl will provide the much needed clearance for the #4 & #2 rods and the respective cam lobes. Even allowing for a cam to make such a stroke reach it's potential.
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Re: Biggest Crank in a Type4
Yes indeed; and if you give that crank the proper heat treatment and make sure it lubes the rod journals well, it will probably work just fine
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks