S&S 570 at 10.3:1?

[jsachs1]

The SE cast pistons have a larger dome (11cc) than the 22868-00A forged pistons (6cc). Also there may be interference with the head by the downward slope of the valve pocket area on the cast pistons.
John
FWIW, the original 22868-00 had 8cc funky looking domes. Doubt that any of those can be found new today.

Thanks John,
Just to clarify,  when I find the HD SE Forged pistons #22868-00A in the online catalogue  they are listed as 10.5 c/r.....      I wish they weren't 10.5 because it would save me a couple hundred dollars.

I used to buy the 22868-00A pistons, 5 packs to the case for years, and you can take it to the bank, that they're 6 cc. domes. The cast pistons, have the 11cc dome. I trust very little that I read, so I cc everything that I use. I still use the 22868-00A pistons on most of my 95" builds.
John

[838]

Reply 25, Street Pro heads and Cr575 at 10.3:1. 2001 ultra efi

Sounds like a good build, should rip. 

When installing manual compression releases to a set of heads, which are the best ones to get?  I've seen some that were $100 a set! Can they be had cheaper?  This woud open my cam choice right up instead of only being able to use S&S  easy start cams.
Thanks

MCRs installed are usually about $150. S&S EZ start cams are about $150 more than a standard set. The way I look at it, you break even there.

[Adam76]

The SE cast pistons have a larger dome (11cc) than the 22868-00A forged pistons (6cc). Also there may be interference with the head by the downward slope of the valve pocket area on the cast pistons.
John
FWIW, the original 22868-00 had 8cc funky looking domes. Doubt that any of those can be found new today.

Thanks John,
Just to clarify,  when I find the HD SE Forged pistons #22868-00A in the online catalogue  they are listed as 10.5 c/r.....      I wish they weren't 10.5 because it would save me a couple hundred dollars.

I used to buy the 22868-00A pistons, 5 packs to the case for years, and you can take it to the bank, that they're 6 cc. domes. The cast pistons, have the 11cc dome. I trust very little that I read, so I cc everything that I use. I still use the 22868-00A pistons on most of my 95" builds.
John

Thanks John, appreciate the verification.   

[04rkryder]

"From what I can see,  KB doesn't offer a piston for a 4.00" stroke TC88 - 95/98" motor.... only 103" and up? "

KB905C 6.7cc 10:1 available STD to +040

[Don D]

In stock here, very common piston

[mrmike]

Yup Hippo build, Screaming Eagle HTCC heads and S&S 570, IIRC.

I've been running the 570 easy starts in a 95" at 10 to 1 for 15+ years.

Blackhills Ken did the build and JSachs did the bore and heads. 106/107

They work.

Mike

Sounds like a winner   

What did you do to beef up the clutch to handle the tq/hp?
Thanks




Already had a VPC so we just put a Barnett extra plate clutch in, works great. Bike has 40,000 miles on this build and clutch total mileage is around 70k.

Mike

[jsachs1]

"From what I can see,  KB doesn't offer a piston for a 4.00" stroke TC88 - 95/98" motor.... only 103" and up? "

KB905C 6.7cc 10:1 available STD to +040

I just did a 95" build with those pistons. Knocked .030" off the domes. Came in at 5.2 cc. I haven't seen the dyno sheet yet, but was told 108 hp. and 111 ft. lbs. ( see reply # 18).
John

[Adam76]

"From what I can see,  KB doesn't offer a piston for a 4.00" stroke TC88 - 95/98" motor.... only 103" and up? "

KB905C 6.7cc 10:1 available STD to +040

😆 you just beat me to it, I just found them also.. 
With regards to the .020 - .040" oversize pistons which increases the bore to closer to a 97" build... Can you get the exact 3.905 / 3.915 size MLS  .030" Cometic head gasket to match the 95" + .020 / .040 oversize bore?

This looks like the way I'm going.
Thanks

[Adam76]

"From what I can see,  KB doesn't offer a piston for a 4.00" stroke TC88 - 95/98" motor.... only 103" and up? "

KB905C 6.7cc 10:1 available STD to +040

I just did a 95" build with those pistons. Knocked .030" off the domes. Came in at 5.2 cc. I haven't seen the dyno sheet yet, but was told 108 hp. and 111 ft. lbs. ( see reply # 18).
John

Thanks for reporting back on this build John. 👍👍
Turned out well.

[Adam76]

Reply 25, Street Pro heads and Cr575 at 10.3:1. 2001 ultra efi

Hi,  in your experience with building and tuning  S&S 570 and CR575 cams in 95"/97" big bore builds.  With a set of later model 96" stock heads (NO headwork) --  which of the 2 cams at around 10-1 / 10.2 compression would do better? Overall TQ probably the most important, area under the curve etc.
Thanks for your advice.