S&S 570 at 10.3:1?

[chris.m.j]

Any issues with running the S&S 570 cam at 10.3? It's a Dyna at 95". Would 10:1 or under be better like S&S suggests?

[kd]

How old are the heads?  A simple valve job will drop that number a bit. I would guess it also depends on what tuner device and who the tuner is.  It'll definitely move the power a tick to the left.

[FXDBI]

big boyz calculator puts the ccp @ 198 using a 95in@10.31 and S&S 570.  Use the EZ Starts if you have no releases , dont see why it wont work just fine. Should have some good grunt from the get go.  Bob

[chris.m.j]

A little more background if needed:

https://harleytechtalk.com/htt/index.php/topic,113583.msg1360542.html#msg1360542

I had what is turning out to be a not so great experience with a small indy shop on this build. I took the motor apart to figure out the compression ratio and have the heads looked at and another shop said they weren't in great shape. They salvaged them for the most part, correcting the intake short run. I guess the flow numbers dropped off a cliff at .400 lift.

They also recommended swapping from a S&S 585 to the 570. The comp ratio would be 10.3 with a .030 head gasket.

[harpwrench]

I ran 570's in a 103 at 10.3 for about 20k, it was good 

[838]

I just helped with one at 10.25:1 no problem.

[Hillside Motorcycle]

Any issues with running the S&S 570 cam at 10.3? It's a Dyna at 95". Would 10:1 or under be better like S&S suggests?

10.3 will work great.

[xlfan]

Wasn't 585 part of the Hippo build?

[tdrglide]

I believe that was the S&S 570.

[838]

The 117" with a .570 we did had enough torque to haul a hippo for sure... trailer not side car 👍

[Prostock]

10:3 is perfect for that 570

[Deye76]

Have seen that cam work well in 88" through 117".

[Hillside Motorcycle]

We currently have that cam in our shop mule bike.
2002 Dyna.
Our Stage II Heads.
98".
CV carb, T/Heart ignition it came with.
Supertrapp 2/1, 39 plates with a closed end cap.
110 hp/115.

[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

[Hillside Motorcycle]

Just competed a 107" w/o headwork, S&S .570 EZ...set the squeeze at 10.3, and tuned it with Direct Link.
103/117....heads would've had another 10 hp + easily and low 20's torque.
Good cam used correctly.

[ndmp40]

Put the EZ start 570s in my 113 dyna this fall.  Its set a 10.5 static.  Runs great, no issues at all. 

[Hillside Motorcycle]

10.3 cr is the safe threshold.

[Adam76]

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

[jsachs1]

A customer just left here with a 95",570 ES, build, 10.2:1, 2 hrs. ago. Dyno results tomorrow or Monday.
John

[Adam76]

A customer just left here with a 95",570 ES, build, 10.2:1, 2 hrs. ago. Dyno results tomorrow or Monday.
John

Thanks John.  Any head work with this build?  How important is the headwork for this recipe and what should be done at a minimum?  Thanks 

[Deye76]

"Yup Hippo build, Screaming Eagle HTCC heads and S&S 570, "
The non HTCC heads, aka SE Performance heads, and 95".

[Scotty]

"Yup Hippo build, Screaming Eagle HTCC heads and S&S 570, "
The non HTCC heads, aka SE Performance heads, and 95".

That's correct SE Performance Heads which were 79cc and the 95" Flat tops and the 570 cam.

[Adam76]

"Yup Hippo build, Screaming Eagle HTCC heads and S&S 570, "
The non HTCC heads, aka SE Performance heads, and 95".

That's correct SE Performance Heads which were 79cc and the 95" Flat tops and the 570 cam.

Yep, that's what I recall as the hippo build.

If you can't get the SE heads anymore,  what can you do to make the stock heads work in place of the SE performance heads for this hippo recipe? 

[kd]

Maybe you could reduce the cc's in the later SE 110 heads to retain the valve sizes by using domed pistons. The SE 110 heads (and MVA for sure) average 95-96 cc so a domed piston and maybe a bit of a cut combined to give you the 79 cc equivalent IMO should work.  Maybe you can do it with just pistons.  One of the builders familiar with the Hippo build with more knowledge on what is available may be able to help.   

[FXDBI]

"Yup Hippo build, Screaming Eagle HTCC heads and S&S 570, "
The non HTCC heads, aka SE Performance heads, and 95".

That's correct SE Performance Heads which were 79cc and the 95" Flat tops and the 570 cam.

Yep, that's what I recall as the hippo build.

If you can't get the SE heads anymore,  what can you do to make the stock heads work in place of the SE performance heads for this hippo recipe?

SE 10.25/1  piston with stock 85cc chamber  would work.  Sit and play with the calculator @ bigboyz and see what gives you 195ccp. Bob