Cam advice 4” stroke 96bb

[838]

I did the 48s at 9.8:1 in a bagger... I was looking at doing the Andrews 57N conversion cam but was told for my application (2 up touring) the 48 was better... you can do a 57 if you get a cam plate and oil pump from a later twin cam... regardless it looks like our specs are similar and I was told to watch the cams tdc lifts and valve clearance if I were to go bigger than the 48... just food for thought.

[PoorUB]

I ran the 57's in a touring bike and liked them, I ran the 48's for a while too. I like to beat on it once in a while so the 57's were a better choice for me.

I am running the CR570-2 now. Andrews does not make a 57 with the older chain drive so for the OP it doesn't make any difference anyway.

[TorQuePimp]

The 48's at 9.8 are the answer

[1FSTRK]

The 48's at 9.8 are the answer

Interesting, what will the peak power rpm be?

[838]

I am running the CR570-2 now. Andrews does not make a 57 with the older chain drive so for the OP it doesn't make any difference anyway.

Are you running the 570-2 in an older chain drive?

[TorQuePimp]

The 48's at 9.8 are the answer

With those heads.....I dunno

Last one I did with 187 heads and a mostly stock 46 tb made 106/99 peaked at 5600 ish.....with TD and some eBay mufflers

Interesting, what will the peak power rpm be?

[PoorUB]

I am running the CR570-2 now. Andrews does not make a 57 with the older chain drive so for the OP it doesn't make any difference anyway.

Are you running the 570-2 in an older chain drive?

New style.

[Admiral Akbar]

With the flow sheet that you have, I'd pick a cam that has a bit longer exhaust duration than intake.

[Johnwesley]

With the flow sheet that you have, I'd pick a cam that has a bit longer exhaust duration than intake.

To be fair on the head flow, they were designed for use with the 510 cam style. With a lot of blow down in the cam. The exhaust port really only got a valve job and coating. If it was a different style cam then the head would have been ported differently.

This is really a cheap mild build. The only reason the question came to the board was it looks like with a touch more lift I could get better performance. Though it could be that the Tb and intake wouldn't flow well enough to take advantage of more lift. That's  why the questions about other cams, or higher ratio rockers. This cam was in the bike before this work was done and I do like the feel of it. Though it wasn't really tuned in. Just a prebuilt map and then street tuned with wide band O2.

[lt1-xjs]

Andrews did make the TW57 for the 99-06 chains under part 288157. They're still available.

[1FSTRK]

With the flow sheet that you have, I'd pick a cam that has a bit longer exhaust duration than intake.

To be fair on the head flow, they were designed for use with the 510 cam style. With a lot of blow down in the cam. The exhaust port really only got a valve job and coating. If it was a different style cam then the head would have been ported differently.

This is really a cheap mild build. The only reason the question came to the board was it looks like with a touch more lift I could get better performance. Though it could be that the Tb and intake wouldn't flow well enough to take advantage of more lift. That's  why the questions about other cams, or higher ratio rockers. This cam was in the bike before this work was done and I do like the feel of it. Though it wasn't really tuned in. Just a prebuilt map and then street tuned with wide band O2.

I am surprised nobody has mentioned going to the S&S 570 in this build using a .030 HG at 10:1 compression. I would think it would be right at home in this combo. it keeps you at the .570 lift and has the favorable exhaust timing your heads require. Kirby, John Sachs and a couple others have made nice power with it in many different size similar builds and posted them in the dyno section.

[PoorUB]

Andrews did make the TW57 for the 99-06 chains under part 288157. They're still available.

They are not listed in the Andrews 2018 catalog or price list.

[Johnwesley]

With the flow sheet that you have, I'd pick a cam that has a bit longer exhaust duration than intake.

To be fair on the head flow, they were designed for use with the 510 cam style. With a lot of blow down in the cam. The exhaust port really only got a valve job and coating. If it was a different style cam then the head would have been ported differently.

This is really a cheap mild build. The only reason the question came to the board was it looks like with a touch more lift I could get better performance. Though it could be that the Tb and intake wouldn't flow well enough to take advantage of more lift. That's  why the questions about other cams, or higher ratio rockers. This cam was in the bike before this work was done and I do like the feel of it. Though it wasn't really tuned in. Just a prebuilt map and then street tuned with wide band O2.

I am surprised nobody has mentioned going to the S&S 570 in this build using a .030 HG at 10:1 compression. I would think it would be right at home in this combo. it keeps you at the .570 lift and has the favorable exhaust timing your heads require. Kirby, John Sachs and a couple others have made nice power with it in many different size similar builds and posted them in the dyno section.

That's sound like a good option. What's the thought on this chart? It seems to support the idea that the intake would limit the benefit of lifting beyond .500 since that seems to be the limit of flow. 

[attach=0]

[Barrett]

harleytechtalk.com/htt/index.php?topic=91480.msg1054714#msg1054714

The question about extra lift is answered here..

[1FSTRK]

With the flow sheet that you have, I'd pick a cam that has a bit longer exhaust duration than intake.

To be fair on the head flow, they were designed for use with the 510 cam style. With a lot of blow down in the cam. The exhaust port really only got a valve job and coating. If it was a different style cam then the head would have been ported differently.

This is really a cheap mild build. The only reason the question came to the board was it looks like with a touch more lift I could get better performance. Though it could be that the Tb and intake wouldn't flow well enough to take advantage of more lift. That's  why the questions about other cams, or higher ratio rockers. This cam was in the bike before this work was done and I do like the feel of it. Though it wasn't really tuned in. Just a prebuilt map and then street tuned with wide band O2.

I am surprised nobody has mentioned going to the S&S 570 in this build using a .030 HG at 10:1 compression. I would think it would be right at home in this combo. it keeps you at the .570 lift and has the favorable exhaust timing your heads require. Kirby, John Sachs and a couple others have made nice power with it in many different size similar builds and posted them in the dyno section.

That's sound like a good option. What's the thought on this chart? It seems to support the idea that the intake would limit the benefit of lifting beyond .500 since that seems to be the limit of flow. 

If you follow that thinking the flow on the chart really gets hit at about .300 lift and you do not want a .300 lift cam.

The real truth is the higher lift starts helping put more area under the curve right after the tdc lift number. It is true the intake and TB effect the flow numbers but how much will vary with port design as well as manifold design not to mention the fact a manifold and TB update later on could a little boost when you get bored with this set up.

[lt1-xjs]

Andrews did make the TW57 for the 99-06 chains under part 288157. They're still available.

They are not listed in the Andrews 2018 catalog or price list.

You have to call and ask, they have 7 on hand.

[PoorUB]

Andrews did make the TW57 for the 99-06 chains under part 288157. They're still available.

They are not listed in the Andrews 2018 catalog or price list.

You have to call and ask, they have 7 on hand.

That makes them tough to sell!

[DTTJGlide]

There's a new set listed on Ebay for a good price also.