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Author Topic: No stroke all bore?? On an fxr  (Read 11777 times)

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Frisco kid

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No stroke all bore?? On an fxr
« on: December 10, 2012, 01:01:40 AM »


No stroke all bore?
This is what i have been pondering on my fxr.
My bike has 32k miles and stage 2.
I want to go with more (10 to 1) compression and was thinking of increasing bore at same time.
My thought was to have my guy open her up.
If bottom end looks good just bore and go to bigger higher compression pistons.
No need to open up the bottom and save some money.
Same time do some head work and get it all matched up.
I plan to keep my EV27 cam as i like the way it comes on, just want more to come on.
So if bore no stroke, what size to bore to. I would like 88+ inches.
I figure all things being equal 10% more cubes means 10% more tq.
Add to that the higher compression pistons my bike might go from 70 something hp to close to 90.
That would keep me happy for a while.
So who agrees and who doesnt?
And why?
Thanks all!
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SHRADER

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Re: No stroke all bore?? On an fxr
« Reply #1 on: December 10, 2012, 10:35:26 AM »

I don't think that the evo cases, or any others for that matter, will allow but so much bore without machining the spigots for larger cylinders. So in reality what you are wanting to do is not possible. You cannot increase the CI by 10% without going into the bottom end.



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Shrader
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Landshark

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Re: No stroke all bore?? On an fxr
« Reply #2 on: December 10, 2012, 01:30:17 PM »

I put a S & S big bore sidewinder kit on my FLHTC Evo and to do it the cases had to be bored to take the larger cylinders.  Someone else might make something but I don't think so.  Good luck.
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HILLSIDECYCLE.COM

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Re: No stroke all bore?? On an fxr
« Reply #3 on: December 10, 2012, 08:42:24 PM »

Yep.
97" with 3.812" bore cylinders.
The 27 cam will be fine.
Matter of fact built this combo in an FXR for a Special Forces Weapons Instructor not that long ago.
Built quite a few 97" Shovels, and Evo's over the years.
Always a home run. :2vrolijk_21:
Scott
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Frisco kid

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Re: No stroke all bore?? On an fxr
« Reply #4 on: December 11, 2012, 04:59:00 PM »


Hey Hillside can you really get 97" without splitting cases?
Can all the clearences be made with the engine in the chassis?

Also does anyone think more than 10 to 1 or less?
I am looking for a great combo that will be relaible trouble free with great power.
As it is a lighter bike, I donb't see the need for a huge engine with more that 100hp.
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prodrag1320

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Re: No stroke all bore?? On an fxr
« Reply #5 on: December 12, 2012, 07:31:57 AM »

like scott,we`ve also done tons of the 4.25x3.812 builds (a VERY nice shovel or evo build),you`ll have to split the cases and bore the holes.the 4.25 cylinders are no taller than stockers so fitment isnt a problem & compression can be set pretty much where you want.even with very mild headwork your looking at 105+HP/TQ.the biggest you can go will bolt on cylinders is our 85" kit
« Last Edit: December 12, 2012, 07:34:58 AM by prodrag1320 »
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HILLSIDECYCLE.COM

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Re: No stroke all bore?? On an fxr
« Reply #6 on: December 16, 2012, 01:19:46 PM »

Hey Hillside can you really get 97" without splitting cases?
Can all the clearences be made with the engine in the chassis?

Also does anyone think more than 10 to 1 or less?
I am looking for a great combo that will be relaible trouble free with great power.
As it is a lighter bike, I donb't see the need for a huge engine with more that 100hp.


No.
The cases need boring, and we re-balance the crank here, when doing those also.
Cylinder spigot dimension is 4.000", an the cases are bored to 4.005-4.010".
Cam, compression, and cylinder head air flow will all dictate the output of these.
Scott
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ltank

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Re: No stroke all bore?? On an fxr
« Reply #7 on: January 06, 2013, 09:41:55 PM »

I would avoid going more than 10:1 compression on a everyday rider. You need to consider that even the premium gas is not what it used to be. Do you always want to have fuel additives in your back pocket? Pinging or Detonation is bad on wristpins/bearings etc..going with 9.75:1 woulld be a good compromise. I have bee on many major bike events. Sturgis, Daytona, Bike Blues &BBQ and LoneStar rallies. Some gas stations had completly run out of premium gas! and your motor will run hotter. But being a EVO motor you will probably be OK. Be glad you have a EVO and not a TC motor. Alot of Harley shops would be out of busseness if they had not made the TC motors. EVOs are alot more durable, less money to get good HP gains, run cooler. The FI motors just dont sound a good a the carb motors. A few more CI you may want a different cam. just make sure it turns on at the rpm you want ex: 2800 -3200 rpm. The EV 27 has fast ramps that it harder on you lifters and other valve train parts.
Just my two cents,
Ltank
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HILLSIDECYCLE.COM

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Re: No stroke all bore?? On an fxr
« Reply #8 on: January 07, 2013, 08:39:27 AM »

I would avoid going more than 10:1 compression on a everyday rider. You need to consider that even the premium gas is not what it used to be. Do you always want to have fuel additives in your back pocket? Pinging or Detonation is bad on wristpins/bearings etc..going with 9.75:1 woulld be a good compromise. I have bee on many major bike events. Sturgis, Daytona, Bike Blues &BBQ and LoneStar rallies. Some gas stations had completly run out of premium gas! and your motor will run hotter. But being a EVO motor you will probably be OK. Be glad you have a EVO and not a TC motor. Alot of Harley shops would be out of busseness if they had not made the TC motors. EVOs are alot more durable, less money to get good HP gains, run cooler. The FI motors just dont sound a good a the carb motors. A few more CI you may want a different cam. just make sure it turns on at the rpm you want ex: 2800 -3200 rpm. The EV 27 has fast ramps that it harder on you lifters and other valve train parts.
Just my two cents,
Ltank

The cams intake closing number will dictate where the compression, of the given engine combination, needs to set at.
Surely would not want a Wood 9B, or 9F, for instance, set at only 10.0 cr, as it'll be a stone turd, and on the flip side of that, if you set a Crane 300-2B, at 10.0 and your going to have problems.
Scott
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Snakebyte

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Re: No stroke all bore?? On an fxr
« Reply #9 on: March 07, 2015, 11:44:54 PM »

Hey Hillside can you really get 97" without splitting cases?
Can all the clearences be made with the engine in the chassis?

Also does anyone think more than 10 to 1 or less?
I am looking for a great combo that will be relaible trouble free with great power.
As it is a lighter bike, I donb't see the need for a huge engine with more that 100hp.

10-1 compression are we talking static?
At any rate I had helped out a friend build his EVO and we set his compression to 10.65:1 with a wood6. CCP and weisco flat tops. Ended up 204 each cylinder. He runs it in a ElectraGlide. Had to weld the chamber. He runs 92 octane no problems with SE ignition.
Anyway shoot for at least 195 CCP.
As far as splitting the cases, its not a big deal if you do decide to go that route. Bigger bore is way more fun than stroke. Took me a lot of builds to figure this out. Stroke is overrated. If you don't want to take my word for it just look at all the shootout winners and racers. Over square is a lot more fun in a light bike.
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HILLSIDECYCLE.COM

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Re: No stroke all bore?? On an fxr
« Reply #10 on: March 12, 2015, 10:26:07 AM »

97" Evo's are not news, nor are 97" Shovels. Been there, done that yeeeeeeeeeeeeears ago.
Built a lot of those over the years, and several local ones are still in service, including 88" all-bore XL's.
We fluidly move from something along those lines to 2015 models and all points in between............."the pay is the same, if your fighting or marching".
Scott
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Ridgerunr

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Re: No stroke all bore?? On an fxr
« Reply #11 on: March 23, 2015, 07:55:05 AM »

Stock Evo cases are questionable IME with big bore cyls., tend to weep, especially the rear. I don't know what the cost is to rebuild your stock motor into a big bore. Might look into the S&S 111" crate motor, square motor=smooth power and a warranty.
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ltank

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Re: No stroke all bore?? On an fxr
« Reply #12 on: March 23, 2015, 01:18:00 PM »

I have a S&S V111. It is smooth,  has really great power for a touring motor. I can run it all day in 100 degrees and oil temp is never over 190. No leaks, no problem. Got 60,000 on this motor and a tappet just starting to make a slight ticking noise. I am very satisfied. Smokes HD 110, taken several 3500 mile trips with average interstate speeds 80 mph. Love it.
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Re: No stroke all bore?? On an fxr
« Reply #13 on: March 23, 2015, 02:56:10 PM »

I have a S&S V111. It is smooth,  has really great power for a touring motor. I can run it all day in 100 degrees and oil temp is never over 190. No leaks, no problem. Got 60,000 on this motor and a tappet just starting to make a slight ticking noise. I am very satisfied. Smokes HD 110, taken several 3500 mile trips with average interstate speeds 80 mph. Love it.
Pipes look like she's runnin good. :2vrolijk_21:
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ltank

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Re: No stroke all bore?? On an fxr
« Reply #14 on: March 23, 2015, 09:55:30 PM »

She Runs Great! Pipes are custom S.S. Stepped 2 into 1 pipes.
There is moderate discoloration the 1st two inches. A lot of S.S.
Pipes turn purple/black about a foot due to excessive heat telling you bike is out of tune. I get 50 MPG on the highway at speeds 70 to 85. Past 85 will the GPM takes a hit to 38 or so.
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