Cylinder heads
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Cruiser
Joined: Jul 2011
Posts: 177
Likes: 4
From: Keller, TX
Cylinder heads
I am looking at changing the pistons in my bike to 10:1 compression and having some head work done. My question though is do I look at running some S&S heads or just have mine ported and polished and completely re-worked. Seems like the the price would be close to the same whether I re-work mine or put S&S heads on it. The motor is pretty much stock except an EV3, Mikuni HSR 42, and a Single Fire Ignition. Love my bike, but looking for a little more out of the motor to make it run with the newer ones.
Club Member
Joined: Aug 2008
Posts: 22,841
Likes: 17,873
From: Lafayette, Louisiana
At what rpm range do you feel your bike is lacking? I bet it is the lower rpm, right off the line.
Have a look at this
http://www.andrewsproducts.com/sites.../page_10_0.pdf
The EV3 cam you have is for 2,800-6,500 rpm. Most people that use an Andrews cam prefer the EV13 or EV27
The first thing you should do is a compression test of both cylinders to see what you are working with. The results of that can make a big difference on what the recommendation is. I suspect that your compression is probably going to be on the low side.
Back in the day, Jerry Branch of Branch Flowmetrics was the man with regard to head work. These days, Hillside Cycles has a stellar reputation for excellent headwork.
How many miles does the bike have? Tell us about your exhaust.
BTW, I have surprised more than a few TC103’s disappearing in my mirrors with my very mild build. I think it’s because I concentrated on usable every day torque at the rpm I ride instead of high rpm peak horsepower.
Have a look at this
http://www.andrewsproducts.com/sites.../page_10_0.pdf
The EV3 cam you have is for 2,800-6,500 rpm. Most people that use an Andrews cam prefer the EV13 or EV27
The first thing you should do is a compression test of both cylinders to see what you are working with. The results of that can make a big difference on what the recommendation is. I suspect that your compression is probably going to be on the low side.
Back in the day, Jerry Branch of Branch Flowmetrics was the man with regard to head work. These days, Hillside Cycles has a stellar reputation for excellent headwork.
How many miles does the bike have? Tell us about your exhaust.
BTW, I have surprised more than a few TC103’s disappearing in my mirrors with my very mild build. I think it’s because I concentrated on usable every day torque at the rpm I ride instead of high rpm peak horsepower.
Last edited by Prot; Mar 3, 2018 at 04:17 PM.
Thread Starter
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Cruiser
Joined: Jul 2011
Posts: 177
Likes: 4
From: Keller, TX
Off the line she’s pretty stout. But when I’m running down the highway, if I’m running 70-75 up a hill and try to speed up it doesn’t seem to want to go. Bike runs solid as it is I just feel like I she needs a little more. The bottom end has around 25k and the top end about 2k. The exhaust is Vance and Hines big shot longs. A lot of people think they are the same as long shots. But they aren’t.
Club Member
Joined: Aug 2008
Posts: 22,841
Likes: 17,873
From: Lafayette, Louisiana
The cheapest way to address the problem is a swapping the cam to an EV27 or EV13. It sounds like you are ok with horsepower but need more torque. Another thing is a pulley swap, effectively giving you a lower gear ratio (numerically higher)
Before doing anything though, would really like to see compression of both cylinders.
Do you have baffles in your pipes?
I realize these questions and comments aren’t directly answering your questions, but I don’t like to see people waste money and don’t want to lead you astray.
Before doing anything though, would really like to see compression of both cylinders.
Do you have baffles in your pipes?
I realize these questions and comments aren’t directly answering your questions, but I don’t like to see people waste money and don’t want to lead you astray.
Last edited by Prot; Mar 3, 2018 at 05:41 PM.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
Likes: 7,549
From: Poolville
If you want to bump your comp to 10:1 none of those 3 cams will be a good choice. All 3 have to early of an intake valve close that could cause detonation or tuning problems... One of the best builds I've ever seen in an Evo with out pushing reliability is Wiseco 10:1 pistons, Stage II heads with an 83 cc combustion chamber, Woods W6 cam, Port matched intake with the S&S E which you already have.. With the right pipe high 80's low 90's and still get 42mpg.. AND no need to do a gear ratio change... I honestly never seen a better build than this for an Evo....
You can get real good info from Scott@Hillside. I was one of his best dependable 80" build years back....
You can get real good info from Scott@Hillside. I was one of his best dependable 80" build years back....
Last edited by 98hotrodfatboy; Mar 3, 2018 at 07:30 PM.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
There's Andrews cams out there as well that'll work with 10:1 if you're hellbent on Andrews but the Woods are better. Just be advised, watch cam lift so you don't stress your valvetrain too much. Andrews are pretty friendly in that regard.
Thread Starter
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Cruiser
Joined: Jul 2011
Posts: 177
Likes: 4
From: Keller, TX
The cheapest way to address the problem is a swapping the cam to an EV27 or EV13. It sounds like you are ok with horsepower but need more torque. Another thing is a pulley swap, effectively giving you a lower gear ratio (numerically higher)
Before doing anything though, would really like to see compression of both cylinders.
Do you have baffles in your pipes?
I realize these questions and comments arent directly answering your questions, but I dont like to see people waste money and dont want to lead you astray.
Before doing anything though, would really like to see compression of both cylinders.
Do you have baffles in your pipes?
I realize these questions and comments arent directly answering your questions, but I dont like to see people waste money and dont want to lead you astray.
The pipes do have baffles, I will try to do a compression test later today if not tomorrow. And I would like the torque and horsepower to be bumped some.
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Club Member
Joined: Jun 2007
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From: Bedford UK
Another shout for Scott at Hillside. I don't believe there is any benefit in buying new heads, when there are experienced tuners out there who can get yet better performance with your current ones. I'm a dedicated S&S fan and have one of their 107" engines, but Scott can increase power and torque of it by around 15-20%, going by his website claims. In other words if you pay out for S&S heads you may be leaving that sort of extra performance behind.
I'm not a customer of Scotts, however Hillside are an HDF sponsor and he is highly regarded all around, as well as dispensing great advice and common sense in here. Well worth picking up the phone....
I'm not a customer of Scotts, however Hillside are an HDF sponsor and he is highly regarded all around, as well as dispensing great advice and common sense in here. Well worth picking up the phone....
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
Likes: 7,549
From: Poolville
Another shout for Scott at Hillside. I don't believe there is any benefit in buying new heads, when there are experienced tuners out there who can get yet better performance with your current ones. I'm a dedicated S&S fan and have one of their 107" engines, but Scott can increase power and torque of it by around 15-20%, going by his website claims. In other words if you pay out for S&S heads you may be leaving that sort of extra performance behind.
I'm not a customer of Scotts, however Hillside are an HDF sponsor and he is highly regarded all around, as well as dispensing great advice and common sense in here. Well worth picking up the phone....
I'm not a customer of Scotts, however Hillside are an HDF sponsor and he is highly regarded all around, as well as dispensing great advice and common sense in here. Well worth picking up the phone....
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