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96” works

96” works

Aussiesmiler
2 years ago

Hi all, have the old 07 fatty that I’ve stage 2 already and thinking maybe stage 3. Do you think boring to 107 and doing some head work is really worth it. Cheers

WideglidingNZ
2 years ago

hi mate it depends if you are happy spending the money, personally I think it's worth it, have a look at the attached dyno charts from Fuelmoto there are big bore 107's included-https://university.fuelmotousa.com/dyno-charts/ this should help you to find the right cam for where you want the power eg- low down torque or rev the needle to the redline power/hp

Aussiesmiler
2 years ago

Thanks for your information wideglidingNZ

tussuck
2 years ago

OR..... one of those turbo units that bolts onto the primary side! Now thats POWER.

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Lushy
2 years ago

If your pipes are Big Radius , you will waste your money trying to get a good 107 to work. If you are married to the pipes, then build a combo which is sound and make about 100hp at the tyre.

Aussiesmiler
2 years ago

Hey Lushy, no the old girl has had a few upgrades since the photo. Rinehart 2 into 1 S&S cams, intake oil plate & pump. Goes well just thinking of a bit more… of course! 🤙🏻

Grease Monkey
2 years ago

Sounds like you understand the deal, as they say, no replacement for displacement, good heads helps along with the tune.

Lushy
2 years ago

No worries, which cams?

Aussiesmiler
2 years ago

S&S 583’s

crowster69
2 years ago

I took my old 88 cube out to 107 with s&s 585 cams and headwork and 45 mikuni.went very well

Aussiesmiler
2 years ago

Hey Hoodeng, not sure mate what’s your recommendation and thoughts on this, would prefer to only do things once of course. 🍻

Aussiesmiler
2 years ago

They’re recommending bore the standard cylinders to 107 and do some head work while doing the decomps. Other than that I haven’t discussed much as I don’t know a lot about it.

Aussiesmiler
2 years ago

I was told the S&S 583 would be a good mix for when the 107 works were done… would you disagree or what comp would you suggest with these cams. 🍻

John.R
2 years ago

Quoting Aussiesmiler on 19 Apr 2023 08:33 AM
I was told the S&S 583 would be a good mix for when the 107 works were done… would you disagree or what comp would you suggest with these cams. 🍻

Just plugging some of these knows in the a compression calculator, those cams on a 107 setup will have your compression pretty bloody high.... on stock flat tops with stock size HG you'll be at 211+ CCP

You need to rethink this setup, or work with someone who can guide you holistically (obviously whoever your buying the parts from and who's doing the work)

Far Canal
2 years ago

Also it is important to keep in mind who you are.
Whatever you do there will be people who can ride much faster than you on lesser bikes.

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Aussiesmiler
2 years ago

Quoting Aussiesmiler on 19 Apr 2023 08:33 AM
I was told the S&S 583 would be a good mix for when the 107 works were done… would you disagree or what comp would you suggest with these cams. 🍻

Quoting John.R on 19 Apr 2023 10:11 AM
Just plugging some of these knows in the a compression calculator, those cams on a 107 setup will have your compression pretty bloody high.... on stock flat tops with stock size HG you'll be at 211+ CCP

You need to rethink this setup, or work with someone who can guide you holistically (obviously whoever your buying the parts from and who's doing the work)

Thanks for the advice

Lushy
2 years ago

I have just fixed a job for a customer, which was done with a 107 kitted bike, 10.5 comp and these 583 cams. It had partially seized and was running like shyte. WAAY too much cylinder pressure. It was an unpleasant experience for both the owner and myself, costly as well. As others have suggested the early ( super early) inlet close figure means this cam is ok for what you have now ie: getting good low end in a stock low comp 96 cube motor. I would respectfully suggest that whomever told you to use those cams in a 107 is not where you should be getting your next job done.

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Aussiesmiler
2 years ago

Quoting Lushy on 20 Apr 2023 02:25 AM
I have just fixed a job for a customer, which was done with a 107 kitted bike, 10.5 comp and these 583 cams. It had partially seized and was running like shyte. WAAY too much cylinder pressure. It was an unpleasant experience for both the owner and myself, costly as well. As others have suggested the early ( super early) inlet close figure means this cam is ok for what you have now ie: getting good low end in a stock low comp 96 cube motor. I would respectfully suggest that whomever told you to use those cams in a 107 is not where you should be getting your next job done.

Interesting! Thanks for you response. Would you suggest just some head work with a good tune and not go the 107 or remove the cams before it’s all turns bad?

Grease Monkey
2 years ago

You are in good hands with Hoody and Lushy mate, the big question here is how do you ride and what do you want from the engine? Answer that and they can guide you to your goal.

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Lushy
2 years ago

Like GM asked, how do you ride, what do you want from the bike. If you are at 96 cubes,and want headwork, then you would need pistons, so the valve cutaways are good for larger valves, so I would select a piston (comp) and cam to suit what you want, and go from there.. The one I just fixed, budget was an significant issue as he had already spent his money, so we changed the cam and valve springs, left the stock heads, but made them sound. You have options as you do not have to "rescue" anything. How many kms has the motor done??

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