S&S 570 at 10.3:1?

[Don D]

Mill stock heads to 79cc and add a 1.9 intake valve and 1.61 exhaust, similar to my Street Pro package, $499. I prefer a small domed forged piston and a small amount of milling which eliminates the valve pocket issue which fixing was mandatory with the old Hippo build and stock cast pistons. The SE performance heads had a 1.9 x 1.625 valve package and were milled .060 right out of the box plus had the intake flanges were adjusted accordingly.

[kd]

   I was guessing just milling would mean possible valve pocket concerns so I figured small domed pistons could get you close. (without knowing the stock head cc) The 110 or MVA valves may be too large for this 95" build.

[jsachs1]

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 

IMO, if you want to make over 95 hp., you will need head work.
John

[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?

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

Thanks Bob,  I must new doing something wrong with the calculator 😆 
With SE/10.25  and the 570 cams I keep getting 9.81 corrected compression and 206 ccp??
That's still assuming 85cc heads as well.

[Scotty]

Thanks Bob,  I must new doing something wrong with the calculator 😆 
With SE/10.25  and the 570 cams I keep getting 9.81 corrected compression and 206 ccp??
That's still assuming 85cc heads as well.

Also you are assuming 0 deck height and this was never the case with the stock twin cam cylinders bored out or buying 95" cylinders the pistons were always below 0 deck which you have to torque down and measure to cut the base of the cylinder to achieve 0 deck and was not part of the scope for a hippo build.
Hippos build also opened up the piston valve pockets as well which further reduced volume even when using 79cc heads.
So I can't find my notes but from memory they were .003-.005 down the hole and that might not be correct but it's close.

[Adam76]

Thanks Bob,  I must new doing something wrong with the calculator 😆 
With SE/10.25  and the 570 cams I keep getting 9.81 corrected compression and 206 ccp??
That's still assuming 85cc heads as well.

Also you are assuming 0 deck height and this was never the case with the stock twin cam cylinders bored out or buying 95" cylinders the pistons were always below 0 deck which you have to torque down and measure to cut the base of the cylinder to achieve 0 deck and was not part of the scope for a hippo build.
Hippos build also opened up the piston valve pockets as well which further reduced volume even when using 79cc heads.
So I can't find my notes but from memory they were .003-.005 down the hole and that might not be correct but it's close.

Thanks Scotty, i knew they would be at least a few thou in the hole,  but even .004 in the hole still gives 204.4ccp?

Going to a 9,5 comp piston and 83cc heads comes out with just over 10.2 comp and 192ccp even with the pistons sitting a few thou down in the hole.  Just another way to get the desired compression I guess.   

[Scotty]

Thanks Scotty, i knew they would be at least a few thou in the hole,  but even .004 in the hole still gives 204.4ccp?
Going to a 9,5 comp piston and 83cc heads comes out with just over 10.2 comp and 192ccp even with the pistons sitting a few thou down in the hole.  Just another way to get the desired compression I guess.   

I punched the numbers in and I would run it as is and I don't think you would have a problem.
[attach=0]

[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.

[Scotty]

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.

That is half the problem when trying to follow a recipe with different ingredients. Sometimes it just don't work.
Any pistons available that would work to achieve what he wants?

The 22868-00A pistons still appear as available or are they slightly different to the 22868-00 ??

[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,
Yrs I would prefer a 6cc dome.... I think CP or J&E do pistons in those sizes. More $$$ but better to do it right the f first time.
Thanks again

[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.

That is half the problem when trying to follow a recipe with different ingredients. Sometimes it just don't work.
Any pistons available that would work to achieve what he wants?

The 22868-00A pistons still appear as available or are they slightly different to the 22868-00 ??

Thanks Scotty,  the 22868-00A looks like a good possible option as long as I don't run into any trouble with the shape of the dome?
Cheers

*** seems like I have hijacked this thread  (sorry). ****

I'll start my own build thread now.

Thanks guys. 

[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.

[Scotty]

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.

That is why I asked if the A changed the dome did you look at the image I attached?
It lists the A revision at 9.6:1 with stock heads and 10.5:1 with Kompressor heads.
The cast are listed at 10.25:1 with stock heads.

[Adam76]

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.

That is why I asked if the A changed the dome did you look at the image I attached?
It lists the A revision at 9.6:1 with stock heads and 10.5:1 with Kompressor heads.
The cast are listed at 10.25:1 with stock heads.

Yes, that could work.
Wiseco also do a 95"  9.5 comp piston that comes in a + .020" which coud be good
CP do  a 10.1 comp 98"  piston that looks perfect. 
Cheers   

[Deye76]

Need to add elevation in the calculator, to get a better idea of corrected compression & cranking pressure.

[838]

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.

That is why I asked if the A changed the dome did you look at the image I attached?
It lists the A revision at 9.6:1 with stock heads and 10.5:1 with Kompressor heads.
The cast are listed at 10.25:1 with stock heads.

Yes, that could work.
Wiseco also do a 95"  9.5 comp piston that comes in a + .020" which coud be good
CP do  a 10.1 comp 98"  piston that looks perfect. 
Cheers   

I've always liked the strategy of going 3.875" + .040" or +.050".  Getting you real close to 98" but still leaving a little extra clearance and opportunity to go 3.938" down the road if needed 👍.

The new KB super duty pistons are excellent and have lots of options.

[838]

Mill stock heads to 79cc and add a 1.9 intake valve and 1.61 exhaust, similar to my Street Pro package, $499. I prefer a small domed forged piston and a small amount of milling which eliminates the valve pocket issue which fixing was mandatory with the old Hippo build and stock cast pistons. The SE performance heads had a 1.9 x 1.625 valve package and were milled .060 right out of the box plus had the intake flanges were adjusted accordingly.

This could work well with the tts-150 conversion cam. Or a CR575 👍

[Don D]

Identical build on my bench right now but it is a 95"

[838]

Identical build on my bench right now but it is a 95"

Identical to which one?

[Don D]

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

[Hossamania]

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

Question on the efi, converted to Delphi?

[Scotty]

Need to add elevation in the calculator, to get a better idea of corrected compression & cranking pressure.

This is Australia mate............fairly flat all over 
Australia is the lowest continent in the world with an average elevation of only 330 metres. The highest points on the other continents are all more than twice the height of Australia's highest peak, Mount Kosciuszko which is 2228 metres above sea level.

[Deye76]

It pays to look at the country under the name. I need to do that more often. 

[Adam76]

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.

That is why I asked if the A changed the dome did you look at the image I attached?
It lists the A revision at 9.6:1 with stock heads and 10.5:1 with Kompressor heads.
The cast are listed at 10.25:1 with stock heads.

Yes, that could work.
Wiseco also do a 95"  9.5 comp piston that comes in a + .020" which coud be good
CP do  a 10.1 comp 98"  piston that looks perfect. 
Cheers   

I've always liked the strategy of going 3.875" + .040" or +.050".  Getting you real close to 98" but still leaving a little extra clearance and opportunity to go 3.938" down the road if needed 👍.

The new KB super duty pistons are excellent and have lots of options.

I like the idea of going 3.875" + 040".... Wiseco might do a piston that size? I know they do a 95" + .020".

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

[Adam76]

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