Engine build help
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Joined: May 2020
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From: PEI Canada
Engine build help
Looking for some input from everyone in regards to my build. Just finishing up installing my 107 big bore on my 2009 dyna, I know the true builders on here are going to give me hell since it ended up being a "one part at a time" type deal and things probably don't work together the greatest. Always seemed to buy one more part thinking it was going to be the last but here we are haha.
Anyways currently engine wise it has
SE Heavy Breather
V&H Super Radius 2:2
Barnett Clutch Spring
Andrews 57h cams
107 big bore with 10.5:1 Wiseco's.
Stock heads
At this point I'm looking into head options and finding keeping my CCP at a reasonable level is a challenge, i don't really have the right cam for the compression I'm running.
Used sets of 79cc S&S super stocks are everywhere for cheap so started playing with some cams in the calculator and would I be wrong in thinking a TW9b would be a pretty decent fit depending on gasket thickness? I have a bit of a heavy throttle, hardly ever do long rides and mostly ride around solo.
Looking forward to hearing opinions!
Anyways currently engine wise it has
SE Heavy Breather
V&H Super Radius 2:2
Barnett Clutch Spring
Andrews 57h cams
107 big bore with 10.5:1 Wiseco's.
Stock heads
At this point I'm looking into head options and finding keeping my CCP at a reasonable level is a challenge, i don't really have the right cam for the compression I'm running.
Used sets of 79cc S&S super stocks are everywhere for cheap so started playing with some cams in the calculator and would I be wrong in thinking a TW9b would be a pretty decent fit depending on gasket thickness? I have a bit of a heavy throttle, hardly ever do long rides and mostly ride around solo.
Looking forward to hearing opinions!
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Joined: Oct 2019
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From: OH
I calculate the 79cc heads running 208 CCP with a .045 gasket ( 3.9 bore 4.3 stroke ) with the TW9
85cc heads / 045 gasket / Andrews 57 also 208CCP
I`m ASSUMING a 3cc piston dome
What # are you shooting for ?
85cc heads / 045 gasket / Andrews 57 also 208CCP
I`m ASSUMING a 3cc piston dome
What # are you shooting for ?
Thread Starter
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Joined: May 2020
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From: PEI Canada
200 CCP with the .045 gasket/TW9/79cc and the same with the 57h and 85cc combo.
Others I've spoken too have said 200 CCP is borderline too much and that 10.5:1 is too much for the 57s so I should be looking into different combos especially if I'm looking at heads. A 79cc head and SE 266e's came up in that conversation but thats getting pretty wild cam wise, does end up with 190-196 CCP though.
Grand HDF Member
Joined: Sep 2017
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From: Dubuque, IA
200psi ccp is not too much. Just need a good tune which you should do anyway.
That said, I'm liking what I see and hear lately on that 9B. In fact, my next build is going down the same road most likely. 107/TW9B and shooting for a ccp of 200 - 210 but with a .030 squish.
I'm at 200psi ccp now and there's people running 210+.
I know these TCs can be a bit more prone to pinging but the moco had a stock ccp of 225 with the rubbermount 1200s.
If your numbers are right, you can't go wrong either way. The 57H is a good cam too. But I would see what you could do with a .030 head gasket if possible even if it meant a ccp of 210 but that's me.
I don't even look at SE cams. But that's me too.
You're right tho, doing it the hard way. lol
What does the tw9, 85cc heads, and .030 head gasket get you? I'm coming up with 193?
Nice looking bike, btw. Real nice.
That said, I'm liking what I see and hear lately on that 9B. In fact, my next build is going down the same road most likely. 107/TW9B and shooting for a ccp of 200 - 210 but with a .030 squish.
I'm at 200psi ccp now and there's people running 210+.
I know these TCs can be a bit more prone to pinging but the moco had a stock ccp of 225 with the rubbermount 1200s.
If your numbers are right, you can't go wrong either way. The 57H is a good cam too. But I would see what you could do with a .030 head gasket if possible even if it meant a ccp of 210 but that's me.
I don't even look at SE cams. But that's me too.
You're right tho, doing it the hard way. lol
What does the tw9, 85cc heads, and .030 head gasket get you? I'm coming up with 193?
Nice looking bike, btw. Real nice.
Last edited by 60Gunner; Dec 15, 2020 at 04:07 PM.
Thread Starter
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Joined: May 2020
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From: PEI Canada
200psi ccp is not too much. Just need a good tune which you should do anyway.
That said, I'm liking what I see and hear lately on that 9B. In fact, my next build is going down the same road most likely. 107/TW9B and shooting for a ccp of 200 - 210 but with a .030 squish.
I'm at 200psi ccp now and there's people running 210+.
I know these TCs can be a bit more prone to pinging but the moco had a stock ccp of 225 with the rubbermount 1200s.
If your numbers are right, you can't go wrong either way. The 57H is a good cam too. But I would see what you could do with a .030 head gasket if possible even if it meant a ccp of 210 but that's me.
I don't even look at SE cams. But that's me too.
You're right tho, doing it the hard way. lol
What does the tw9, 85cc heads, and .030 head gasket get you? I'm coming up with 193?
Nice looking bike, btw. Real nice.
That said, I'm liking what I see and hear lately on that 9B. In fact, my next build is going down the same road most likely. 107/TW9B and shooting for a ccp of 200 - 210 but with a .030 squish.
I'm at 200psi ccp now and there's people running 210+.
I know these TCs can be a bit more prone to pinging but the moco had a stock ccp of 225 with the rubbermount 1200s.
If your numbers are right, you can't go wrong either way. The 57H is a good cam too. But I would see what you could do with a .030 head gasket if possible even if it meant a ccp of 210 but that's me.
I don't even look at SE cams. But that's me too.
You're right tho, doing it the hard way. lol
What does the tw9, 85cc heads, and .030 head gasket get you? I'm coming up with 193?
Nice looking bike, btw. Real nice.
I'm also getting 193 on the 85cc head which is starting to sound pretty good to me, will have to start looking at valve springs to handle that 630 lift. Might just pick up a set of them to keep on the shelf worst comes to worse, the parts hoarding is real
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Posts: 10,672
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From: OH
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Grand HDF Member
Joined: Sep 2017
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From: Dubuque, IA
Thanks! It's got some Ohlins shocks on the rear since that picture to save my back haha
I'm also getting 193 on the 85cc head which is starting to sound pretty good to me, will have to start looking at valve springs to handle that 630 lift. Might just pick up a set of them to keep on the shelf worst comes to worse, the parts hoarding is real
I'm also getting 193 on the 85cc head which is starting to sound pretty good to me, will have to start looking at valve springs to handle that 630 lift. Might just pick up a set of them to keep on the shelf worst comes to worse, the parts hoarding is real
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Thread Starter
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Joined: May 2020
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From: PEI Canada
The more i think on it i think i'm going to end up staying with my 57H cams, with the correct sized head gasket i can get pretty close to a 10.2:1 compression where they like to be and the 200ccp seems to be okay.
CC'd my heads and got 86 1/2 on both doing the test 3 times each so pretty confident im at least half close
Also got my cylinders and pistons on so time to get these things sent off for work.
Hopefully Santa is kind to me and i'll have enough $$$ left over to get them done soon!
CC'd my heads and got 86 1/2 on both doing the test 3 times each so pretty confident im at least half close
Also got my cylinders and pistons on so time to get these things sent off for work.
Hopefully Santa is kind to me and i'll have enough $$$ left over to get them done soon!
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Just a suggestion based on an observation...your method of securing your cylinders...1/2" cpvc couplers used with the short head bolts works great.
Last edited by 60Gunner; Dec 24, 2020 at 04:23 PM.