Cam recommendation for a 88 c.i Evo

[ViennaHog]

Gents,

I admit to have no clue about Evo engines and I need to post a questions related to cam choices.

Bike is a 1987 bagger that will receive a 88 c.i. upgrade cylinder and piston kit. It's an all bore kit with the stock crank and heads.
Bike has a Crane Hi4 single fire ignition and an S&S shorty carb and some SE slip ons.

What is an appropriate cam for an Evo bagger with increased displacement?

TIA

[springer-]

The Andrews EV-27 is a good all around cam.

[1997bagger]

Agree as mentioned, the EV-27 is proven and a safe purchase for your bagger. Realworld opinions say it has some noise because it's aggressive ramps but havn't never heard anyone complain about this cam.

If your compression is in the 10-1 range or more, detonaton could be a problem with the EV-27's early intake closing, I am in this situation as I type, I'm passing my hardknock education on.
High compression needs a little later intake valve closing to relieve some pressure like a EVL-3010, the V-Thunder's seem to setup easy and are quiet.

Woods W6 is probaly the best bolt in cam for power for your application, it needs alot of attention to gear backlash setup and might require a couple of pinion gear changes to be within backlash tolerance or it will be noisy. Many say this cam is to too noisy but after talking to Bob Wood, he said it is improper set up and excessive backlash allowing gear chatter.

[pajoe]

I have read 9.5-1 is the limit for the EV-27. Mine has 10-1 and needed the timing advance curve turned back further than I like in order to eliminate most of the detonation. I also found that retarding the rear cylinder about 3 degrees more than the front helped a lot, but nothing made it run better than a 12 oz bottle of Octane Booster. When I put that in I could run the more aggressive timing curve and it ran really well.

[ViennaHog]

Thanks guys for the recommendation. Will check the chamber volume, piston volume and do a static comp calculation. I believe we will be below 10:1 as it is a stock head.

Thanks again for your input

[hardluk1]

You could contact andrews and talk to them about what you want and have done and see what they have to say. Don't let anyone talk you into a woods camon an evo. They tend to use high lift and short duration cams and evos weak spot is the angle on the exhaust side of the motor. The lifter and push rod don't aline well and can cause problems down the road with the high lift cams,

[1997bagger]

W6 Y 20 40 42 18 240 240 38 100 102 101 0.51 0.51
EV27 Y 20 36 44 16 236 240 36 98 104 101 0.495 0.495

Specs for the W6 and EV27.

W6 is .510 lift considered bolt in, EV27 is .495, not much differance
EV27 has shorter duration than the W6
Ev27 has 36 intake closing, builds compression, its strength
W6 has numbers to build a little more power, but needs comp.

Can't see Woods cams changing the push rod angle and duration in this application is a future problem

89" and 96" Evo's run .585 as an average cam, they live but I guess if you thrash them against the rev limiter regularly, push rod angle could come into play

Headquarters has a compression building bolt in, but has strange numbers

HQ-24 Y 20 36 52 19 236 251 39 98 106.5 102.25 0.5 0.5

[Hillsidecycle.com]

We must have installed well over 100 Bob Wood cams in Evo applications over the years, the W-6 being our favorite.
We won't pull a 27 to replace it with a 6, but if going into it empty, the 6 would be it, set at 9.8-10:1.
You'll experience excellent fuel economy as well.

[cruzencoach]

I've been running an Andrew's EV13 in an 88" S&S cyl/piston kit motor now for last 45K miles. Has the S&S E carb too. It's a mild cam, and does OK, but not a "power house" combo. It's in a '86 bagger and mostly gets run two up, usually with camp gear and pulling a Cyclemate long luggage trailer converted for our two 78# husky dogs riding in it. Fuel mileage isn't too good at high 20's to low 30's, but it's packing a big load. Also running the narrow lower front leg wind deflectors, and wind defelctors on the lower fairing, so pushing against lots more air.

Motor is getting close to needing a freshen up / check over, so may chose another cam then. Any suggestions?

[davidg33]

EV-27 is the top pick....some guys like the Crane 300

[Buster]

The EV-27 is a pretty mild bolt in cam, good cam but mild never the less. If you're looking for the biggest bang for your buck, add some heads to the deal which still isn't a lot of money, then you can upgrade the cam to one that's going to compliment your HP to weight ratio.

[jwtrans]

I have 70k miles on my FXSTC, 30k with a W6 and his K1 needle for the CV. Puts a smile on my face everyday!

[econnor]

I had an 88" evo that had a Red Shift 575 cam with 10.2 compression. The bike (softail) ran very strong.