88 inch cam choice

[Gerry Smith]

I am talking to the guy about the 95 inch. I told him get the top end all fresh and have plenty of power to run with the new 103 inch air cooled bikes.

[Gerry Smith]

I am talking to the guy to go 95 inch. Bigger bore and better pistons and rings. It should run good.

[koko3052]

May as well go for a little headwork & then the cam to match it all! 

[wolf_59]

In the DYNO section click on the archive link and do a search for "37" and you'll find some sheets, some no longer show up but there still few
HTH

[BVHOG]

Did a ton of the 37 builds years ago when everyone was going to the "Bigbore" 95 inch kits. I still feel it is one of the best overall grinds ever made for the twincam 4 inch stroke motor.  I used to set the CC's at 83 and use a 30 gasket and manual comp releases for hot starts.  Don't have to go crazy on the 06 up heads, just a cleanup using stock valves and a good valve job.  These builds routinely made high 90's to 100 hp and 105 to 110 torque depending on exhaust. My nephew had this setup in his 06 Road King and he pulled a heavy trailer from WI to Montana/Wyoming/ Idaho over Beartooth pass etc. two up. Never a problem with low end power (Supertrapp Supermeg pipe)
If you wait long enough someone will suggest a 98 and within another page you might be directed towards a 124

[Ohio HD]

Did a ton of the 37 builds years ago when everyone was going to the "Bigbore" 95 inch kits. I still feel it is one of the best overall grinds ever made for the twincam 4 inch stroke motor.  I used to set the CC's at 83 and use a 30 gasket and manual comp releases for hot starts.  Don't have to go crazy on the 06 up heads, just a cleanup using stock valves and a good valve job.  These builds routinely made high 90's to 100 hp and 105 to 110 torque depending on exhaust. My nephew had this setup in his 06 Road King and he pulled a heavy trailer from WI to Montana/Wyoming/ Idaho over Beartooth pass etc. two up. Never a problem with low end power (Supertrapp Supermeg pipe)
If you wait long enough someone will suggest a 98 and within another page you might be directed towards a 124

                  

[PoorUB]

If pulling the heads going to a 95" is not even a question!! If he is getting the heads reworked he can get them setup to run higher lift cams as well, then bore the cases for a 124"!

[hotbo]

Did a ton of the 37 builds years ago when everyone was going to the "Bigbore" 95 inch kits. I still feel it is one of the best overall grinds ever made for the twincam 4 inch stroke motor.  I used to set the CC's at 83 and use a 30 gasket and manual comp releases for hot starts.  Don't have to go crazy on the 06 up heads, just a cleanup using stock valves and a good valve job.  These builds routinely made high 90's to 100 hp and 105 to 110 torque depending on exhaust. My nephew had this setup in his 06 Road King and he pulled a heavy trailer from WI to Montana/Wyoming/ Idaho over Beartooth pass etc. two up. Never a problem with low end power (Supertrapp Supermeg pipe)
If you wait long enough someone will suggest a 98 and within another page you might be directed towards a 124

I agree with the 37s being a excellent choice for the 95-98 build! love these little cams... to the OP poster. go 95 and have at least a good valve job with the CC set up for the cams! you will really enjoy it,Travis 

[kd]

If pulling the heads going to a 95" is not even a question!! If he is getting the heads reworked he can get them setup to run higher lift cams as well, then bore the cases for a 124"!

Good thinin comrad. It also solves the problem of choosing a cam for the 88"er. 

[Horizonmech]

 Go 95 it's the cheapest horsepower you will ever buy and the 37's will put you right in the "sweet spot". Use a good tuner .....Call Jamie @ Fuelmoto and a canned map they install will be all you need .....

Of course after a year you will want more .....and so it begins   

[kd]

Go 95 it's the cheapest horsepower you will ever buy and the 37's will put you right in the "sweet spot". Use a good tuner .....Call Jamie @ Fuelmoto and a canned map they install will be all you need .....

Of course after a year you will want more .....and so it begins   

Read the previous 2 posts for a short cut. 

[boooby1744]

Go 95 it's the cheapest horsepower you will ever buy and the 37's will put you right in the "sweet spot". Use a good tuner .....Call Jamie @ Fuelmoto and a canned map they install will be all you need .....

Of course after a year you will want more .....and so it begins   

New camplate and hyd adjusters? RedShift 527 over the 37.

[Gerry Smith]

I have had some people tell me I would lose the low end torque with the 37 cam.  i am thinking are 2500 RPMs it will come on good. Looking into a set of S&S 97 inch big bore too.

[Hossamania]

Going big bore, improving the heads a bit, you will most certainly not notice a loss of low end torque, especially compared to a stock 88".

[Gerry Smith]

That is what I was thinking. The bigger bore would dish out more torque and upping the compression with head work.

[Barrett]

37's with 1.725 rockers worked well for my 96".

[wolf_59]

I was less than impressed with them in my 06 Ultra when I went to 95" cr set to 9.6, SOP I lost power from 88" and stock cams lost fuel mileage basically I was disappointed in the whole build
Swapped the cams out with S&S 551 and have been happy with it ever since, great torque from idle to 4500 rpm but my riding is at 6000' elevation and most of it is spent at 2500-3000 rpm
Tried the 37 in my 04 Fatboy 95" at 10.5 cr and found it a lot more impressive

[PoorUB]

Like you found out, 9.6 compression ratio is not enough for the 37's. 10.3-10.5 is where you need to be. Andrews is conservative on thier compression recommendations.

[Gerry Smith]

poorUB that is good to know. The setup I am thinking is 9.7:1. So it should all work out for the good.

[sfmichael]

509 is a great cam but if I were going to have the heads done I would adjust the compression and go with the 48

this ^^^

[TorQuePimp]

509 is a great cam but if I were going to have the heads done I would adjust the compression and go with the 48

this ^^^

X2

[sfmichael]

Did a ton of the 37 builds years ago when everyone was going to the "Bigbore" 95 inch kits. I still feel it is one of the best overall grinds ever made for the twincam 4 inch stroke motor.  I used to set the CC's at 83 and use a 30 gasket and manual comp releases for hot starts.  Don't have to go crazy on the 06 up heads, just a cleanup using stock valves and a good valve job.  These builds routinely made high 90's to 100 hp and 105 to 110 torque depending on exhaust. My nephew had this setup in his 06 Road King and he pulled a heavy trailer from WI to Montana/Wyoming/ Idaho over Beartooth pass etc. two up. Never a problem with low end power (Supertrapp Supermeg pipe)
If you wait long enough someone will suggest a 98 and within another page you might be directed towards a 124

that's good stuff 

[1FSTRK]

Like you found out, 9.6 compression ratio is not enough for the 37's. 10.3-10.5 is where you need to be. Andrews is conservative on thier compression recommendations.

I do not think Andrews has changed the compression recommendation since the cam was testing on 1999 FL models with stock non-adjustable ignitions, carbs and "free flowing" mufflers left over from the Evo's. That stock FL head pipe with CV carb could be too lean on the rear cylinder and too rich on the front at the same time. Sometimes we forget just how far these bikes have come with both quality tuneable ignitions and EFI. One of the best all around cams ever made.

[Hillside Motorcycle]

Plug and play, 88", an Andrews 21 will spank the same bike, with a 37.
And if boring to 95-98", a 26 will make more, sooner, than the 37.

[rking1550]

Got a buddy with a 02 roadking, stayed 88" used some 06 heads with a  fresh valve job. .030 hg. Andrews 48 cam, rineheart true duals. 95-96 tq and 86-87 hp.
  All  the power is in "fun zone"  for most riders,  2-5k rpms. Smooth,  quite.