Stroker crank..What Cylinders?
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
Stroker crank..What Cylinders?
I found an excellent stroker crank to replace my broken oem crank. I am leaning toward a 96" build but the problem I'm having is finding a cylinder kit that will get me up to at least 10.5:1..
What I have found in that inch class is an S&S sidewinder kit 3 5/8 bore but can only get it to 9.88:1 static because they all come with flat tops. My combustion chambers in my heads are set @ 81.5 cc.. When I put in all the numbers it's just not enough compression to support my W8 cam @ 47* ivc.
Is there something else out there that will get me to 10.5:1 or am I gonna have to get a new cam, If so the only cam that I think will work well with that combo is the W6H.
I've been through a lot and would appreciate any and all help. Thanx
What I have found in that inch class is an S&S sidewinder kit 3 5/8 bore but can only get it to 9.88:1 static because they all come with flat tops. My combustion chambers in my heads are set @ 81.5 cc.. When I put in all the numbers it's just not enough compression to support my W8 cam @ 47* ivc.
Is there something else out there that will get me to 10.5:1 or am I gonna have to get a new cam, If so the only cam that I think will work well with that combo is the W6H.
I've been through a lot and would appreciate any and all help. Thanx
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Joined: Aug 2008
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From: Lafayette, Louisiana
How long is the stroke on the crank you found? I may have found something for you but need to know the stroke.
Will this work with what you have?
http://www.axtellsales.com/AXTELL-BT...KIT-BLACK.html
That will get you to 106" which is pretty big and retaining stock height. Since you have a reputation for always wanting to get that last little bit, this will get you all that is left instead of doing multiple tear downs trying to get a little bit more.
It works with a 4 5/8" stroke.
Will this work with what you have?
http://www.axtellsales.com/AXTELL-BT...KIT-BLACK.html
That will get you to 106" which is pretty big and retaining stock height. Since you have a reputation for always wanting to get that last little bit, this will get you all that is left instead of doing multiple tear downs trying to get a little bit more.
It works with a 4 5/8" stroke.
Last edited by Prot; Jul 24, 2016 at 06:37 PM.
Thread Starter
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Seasoned HDF Member
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From: Poolville
Thanx Prot, 4 5/8 stroke. I saw that kit by Axtell but I really don't want to max out the case to 106". I'm going to call them tomorrow to see what other options they may have.. If I can't find any then I think my only option is the W6H cam.
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Joined: Aug 2008
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From: Lafayette, Louisiana
Have you looked at individual S&S components instead of their kits? I saw Pistons on their site of various configurations, valve reliefs, domed, etc. So maybe getting the correct pair of Pistons then get the cylinders etc. instead of getting a preselected kit since their kits lack what you need.
Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
I found an excellent stroker crank to replace my broken oem crank. I am leaning toward a 96" build but the problem I'm having is finding a cylinder kit that will get me up to at least 10.5:1..
What I have found in that inch class is an S&S sidewinder kit 3 5/8 bore but can only get it to 9.88:1 static because they all come with flat tops. My combustion chambers in my heads are set @ 81.5 cc.. When I put in all the numbers it's just not enough compression to support my W8 cam @ 47* ivc.
Is there something else out there that will get me to 10.5:1 or am I gonna have to get a new cam, If so the only cam that I think will work well with that combo is the W6H.
I've been through a lot and would appreciate any and all help. Thanx
What I have found in that inch class is an S&S sidewinder kit 3 5/8 bore but can only get it to 9.88:1 static because they all come with flat tops. My combustion chambers in my heads are set @ 81.5 cc.. When I put in all the numbers it's just not enough compression to support my W8 cam @ 47* ivc.
Is there something else out there that will get me to 10.5:1 or am I gonna have to get a new cam, If so the only cam that I think will work well with that combo is the W6H.
I've been through a lot and would appreciate any and all help. Thanx
Seasoned HDF Member
Joined: Aug 2008
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From: Ohio
Going to have to cut those HD heads down to 76 cc or so, not much except big bores for the 4 5/8 with all sporting flat tops, Axtell, Sputhe, Rev Performance. Sachs said it takes to much work to get HD heads to work for the 106" range because I was looking at that build to keep the engine looking stock and gave up after thinking stock cases and money spent to still have a case crack although Axtell said the later cases will hold.
See if Hillside can cut those S&S cylinders down on the bottom to lower them in the case to get your compression up? just a thought.
See if Hillside can cut those S&S cylinders down on the bottom to lower them in the case to get your compression up? just a thought.
Club Member
Joined: Aug 2008
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From: Lafayette, Louisiana
This table can help you out. What size is the bore of your cases? According to this chart, 80" and 89" will have the same case bite but going to 96" requires larger.
http://www.ultimaproducts.com/CylPistons1.pdf
http://www.ultimaproducts.com/CylPistons1.pdf
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Club Member
Joined: Aug 2008
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From: Lafayette, Louisiana
I am with THC about shaving the heads slightly, but if that is not feasible due to not enough clearance because of a high lift cam, lack of adequate valve reliefs in the Pistons or whatever, you could also go .020" or .030" over to increase compression.
Here is a calculator that lets you experiment with a lot of things such as cam selector, gasket thickness, etc.
I used this extensively when I was doing all the hand wringing to figure out what I needed a couple of years ago.
http://www.bigboyzheadporting.com/EVOComp.htm
Here is a calculator that lets you experiment with a lot of things such as cam selector, gasket thickness, etc.
I used this extensively when I was doing all the hand wringing to figure out what I needed a couple of years ago.
http://www.bigboyzheadporting.com/EVOComp.htm
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From: la la land jerzey
Hey - as a guy with the one bike you have, looking for max engine out put and street riding DOES not work
1 you dont own a bike - race shop not helpfull in this
2 you dont have endless cash to spend - well maybe you do
3 more then one reason exist for all the combos to have flat tops - no one keeping special parts for them selves BTW
4 the 96'' evo engine is a good power unit cam choices will set it apart and its very streetable with 9 to 1 == you cant buy the fuel and your block wont take the beating
5 did you find the end of reliability in a 80 inch the next one will be even shorter in life
1 you dont own a bike - race shop not helpfull in this
2 you dont have endless cash to spend - well maybe you do
3 more then one reason exist for all the combos to have flat tops - no one keeping special parts for them selves BTW
4 the 96'' evo engine is a good power unit cam choices will set it apart and its very streetable with 9 to 1 == you cant buy the fuel and your block wont take the beating
5 did you find the end of reliability in a 80 inch the next one will be even shorter in life
Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
Going to have to cut those HD heads down to 76 cc or so, not much except big bores for the 4 5/8 with all sporting flat tops, Axtell, Sputhe, Rev Performance. Sachs said it takes to much work to get HD heads to work for the 106" range because I was looking at that build to keep the engine looking stock and gave up after thinking stock cases and money spent to still have a case crack although Axtell said the later cases will hold.
See if Hillside can cut those S&S cylinders down on the bottom to lower them in the case to get your compression up? just a thought.
See if Hillside can cut those S&S cylinders down on the bottom to lower them in the case to get your compression up? just a thought.
That is exactly what I've been hearing which is one of the reasons I am only going to 96". The other is that the 96" flat tops create more comp than doing the 89" build.
THC,
I really don't want to take any more off the heads, I can never get that back.
Prot,
That is what I probably will do, the .030 over. It will at the least get me to 10.04:1 which will do well with the W6h.
I think that whenever you go from a small block to a big block it's all about torque and not high rpm power so with that it's probably gonna be the W6h.