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[bobsplus]

I have a 2011 cvo Roadglide, with the following upgrades, Thundermax, Rinehart truduals, HPI 58mm throttle body and TW-777 cams
,  dynoed at 104hp, 107tq, the torgue curve was between 3000-5000 rpm, stayed up.
I wanted more.... pulled top end, and bought Wiseco 10.5-1 pistons, stock size, had jugs honed, I did some minor porting in the heads, lapped the valves in and reassembled. Went back to the dyno........ 94hp and 110 tq,  and the torque curve drops off, peeks at 3300 and starts falling around 4000, WTF.... my dyno man says no way do I have 10.5-1 compression, pulled plugs and compression was at 155 and 165 on the compression, he's right, says it should be 190-200.  I thinking pull it down, send jugs/pistons and heads out and have heads cnc'ed and have them set it up for reassembly..... may have to have oversized pistons and bored..... Can I do a leak down test and possibly determine the leaking area.........any help appreciated,  I see some great numbers put up by guys without this much work in their bikes..... i'm looking for 120/120 on  pump gas,

[MrSurly]

Those first numbers weren't way out of line; the 777 needs compression or you'll have no bottom end.
The second time I thought you were going the right way as that cam will come to life at 10.8, but obviously something went wrong on the install. Did you get the cam chain wrong?
Adjustable pushrods?
Re adjust them; you may be holding the vales open just a bit too long.
Those pipes aren't  a great choice for torque, I'm sure someone will point out, but they're not causing this trouble.
Was the Dyno just a run to see what it was doing, (base line) or after a complete tune?
The Pistons were built for 10.5 with the 95cc heads? They should have been domed not flattop.
How deep in the hole were they?
Were the jugs honed to fit the new pistons?
What was the clearance?
What head gasket?


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[hrdtail78]

I would do a leak down before pulling it apart.  If that doesn't show anything.  I would start at the cam chest and make sure cams are timed correctly.

Are you taking the auto compression releases out of the equation when you do a compression check?

For no particular reason, and OT.  Who grinds Woods cams?

[MrSurly]

Well, if you DO swap Pistons again, you certainly should consider going to 113 as it's virtually *free* at that point


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[DCFIREMANN]

Well, if you DO swap Pistons again, you certainly should consider going to 113 as it's virtually *free* at that point


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Exactly. Take the motor to 113 and change the cams. Put a cam in that will give you a lot of grunt down low. I just did a 113 build on my 14 Limited and went with the TC-24D cams. If I had thought about it a little more I would have used the GMR 600 or the T-Man 590 or 600 cams in the build.

Good luck with the build.

Be Safe

THE DAWG

[bobsplus]

Those first numbers weren't way out of line; the 777 needs compression or you'll have no bottom end.
The second time I thought you were going the right way as that cam will come to life at 10.8, but obviously something went wrong on the install. Did you get the cam chain wrong?
Adjustable pushrods?
Re adjust them; you may be holding the vales open just a bit too long.
Those pipes aren't  a great choice for torque, I'm sure someone will point out, but they're not causing this trouble.
Was the Dyno just a run to see what it was doing, (base line) or after a complete tune?
The Pistons were built for 10.5 with the 95cc heads? They should have been domed not flattop.
How deep in the hole were they?
Were the jugs honed to fit the new pistons?
What was the clearance?
What head gasket?


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They were flat top, but the wrist pin hole was slightly lower raising the piston on the stroke, how much I don't know....

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[bobsplus]

Those first numbers weren't way out of line; the 777 needs compression or you'll have no bottom end.
The second time I thought you were going the right way as that cam will come to life at 10.8, but obviously something went wrong on the install. Did you get the cam chain wrong?
Adjustable pushrods?
Re adjust them; you may be holding the vales open just a bit too long.
Those pipes aren't  a great choice for torque, I'm sure someone will point out, but they're not causing this trouble.
Was the Dyno just a run to see what it was doing, (base line) or after a complete tune?
The Pistons were built for 10.5 with the 95cc heads? They should have been domed not flattop.
How deep in the hole were they?
Were the jugs honed to fit the new pistons?
What was the clearance?
What head gasket?


Sent from my iPhone using Tapatalk

Wiseco wanted .0025, the local machine shop said they were .0030, after light hone,  and that would be fine...?? Hum.....

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[bobsplus]

Those first numbers weren't way out of line; the 777 needs compression or you'll have no bottom end.
The second time I thought you were going the right way as that cam will come to life at 10.8, but obviously something went wrong on the install. Did you get the cam chain wrong?
Adjustable pushrods?
Re adjust them; you may be holding the vales open just a bit too long.
Those pipes aren't  a great choice for torque, I'm sure someone will point out, but they're not causing this trouble.
Was the Dyno just a run to see what it was doing, (base line) or after a complete tune?
The Pistons were built for 10.5 with the 95cc heads? They should have been domed not flattop.
How deep in the hole were they?
Were the jugs honed to fit the new pistons?
What was the clearance?
What head gasket?


Sent from my iPhone using Tapatalk

The tuner didn't spend much time on it, he couldn't get the thunder max to read the current map on ecm, which was his map from previous tune,  he hastily downloaded another map and did 3 pulls and was done, this was at Daytona Bike week, I was not a happy camper.....with him.....I had to force him to talk to me about the situation, as he was busy pushing bikes out to make his quick money.....as far as gaskets they came with the Wisco kit, and I didn't take a clearance measurement, as I'm not ace mechanic.....and not sure how to measure that....

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[bobsplus]

I would do a leak down before pulling it apart.  If that doesn't show anything.  I would start at the cam chest and make sure cams are timed correctly.

Are you taking the auto compression releases out of the equation when you do a compression check?

For no particular reason, and OT.  Who grinds Woods cams?

Not sure who grinds woods

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[bobsplus]

I would do a leak down before pulling it apart.  If that doesn't show anything.  I would start at the cam chest and make sure cams are timed correctly.

Are you taking the auto compression releases out of the equation when you do a compression check?

For no particular reason, and OT.  Who grinds Woods cams?

Should I unplug the compression buttons? To check the compression

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[cvosjoe]

Not sure who grinds woods

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I believe Andrews grinds Woods cams.

[MrSurly]

Yes, to do a compression check, un plug the ACRs and prop the throttle blade open.

With the CVO 95cc heads, flattop pistons are not going to get you to 10.5cr.

The calc says 9.8 at best with flat tops, unless the heads have been milled or the Pistons stand proud of the cylinders.

[bobsplus]

I'm thinking, pulling the heads, and send out and take to 113, and new domed pistons, and ditch the cams?? I want low end grunt, not into winding it up over 5k...... as I don't want to do the bottom end..... Dan from Zippers spoke to me at Daytona and said he would fit everything,,,,,,,

[bobsplus]

will do compression and a leak test today......and report back....

[HD Street Performance]

You have issues that will be solved at 113" with the right pistons.
The 777 will like 10.5. You did nothing to gain compression with the piston swap and created a sloppy fit to boot by the hone I'm sure.
That is all you need to do to have a strong running motorcycle, head work is optional.