Im about to start my 80" build. Next week Ill be ordering all the goodies, Cam .510 lift & cam bearings, new stock lifters, S&S adj pushrods, ignition dyna adj, build & shave heads, 10.5/1 pistons. Right now the 80" is almost stock but is peppy enough to pull the front tire off the grd in second without banging it. 22,000 mi on the bike now. Am I going to high on my compression, flat top or domed? Any input from the pros is welcome. I already have the new S&S E carb.

 

I am always wary of shaving heads! If you are going to have any head work done, talk through what you want of your bike with your local friendly tuning shop. A little light head work along with a suitable cam and CR can give better results when matched together. I am a convert to talking to an expert rather than trying to do it myself. There are some hi-tech cams out there now, from the likes of Woods, which some tuning shops know how to get the best from. HDF also has a few tuners who are sponsors and can advise.

 

Thanks Grbrown, I think Ill ditch the shaving of the heads especially if I go 10 or 10.5 cr. not much to be gained there anyway. The way oboma wants to kill our gas I probably ought to go with 10/1 cr so I dont get preknock. Since the heads will be pulled Im not to sure if I need adj pushrods either, one less thing to loosen up. I was thinking of the woods W6 .

 

Humm, must of posted in the wrong forum, thanks anyway.

 

I don't think so - you're in Evo-land here, which seems right and proper!

 

Thanks Gr, your always a good one to help out. If I had an extra 2k id just put a 111 S&S on it but Im a poor man wanting rich toys. I can get this build done for $2300. instead of $5k on the S&S. Just wondering if there are some flat top pistons at 10/1 cr I can get? Need to do a search.

 

Talk to the tuners as big bad GR Brown suggested.

 

Thanks greeno, I think Im catching on. For some reason I thought this was a forum to discuss such things. All good, have a nice day.

 

Ok, discussion you want then I'll unload what I know and by far not a professional as you are seeking, just a trial and error guy that had professionals in his corner, you probaly scared everyone off as the Evo section is common guys that know just enough to be dangerous and won't claim top of the food chain, everyone knows alittle and come up with the answers as a group .

If a W6 is a direction you persue, 10-1 is a good goal, the W6 has a fairly early intake closing that is a compression builder. The W6 is a horse in the lows and midrange and perfect for a large barge but a good fundimental setup for any bike.

Now since you are running a light bike and looking for some giddyup, the 10.5-1 compression comes into play with a W9 as this cam will let some air out of the cylinders with it's intake closing and duration so it needs some compression to carry it through lower rpm's or it will be a marshmellow down low. You will need to send the stock heads out to a professional with your desired setup, the flow will be changed, springs to match the cam and will set the optimum compression for that cam. Pistons you purchase might need a.030 head gasket or heads slightly milled to get that compression. Let a professional do your heads such as Hillside, Bean @ Big Boyz, my man is John Sachs - these guys are in the $600 range and experiance in headwork and helping setup a engine is priceless.

Woods cams are monsters but need detail, a cam in the 590 range should have roller rockers, the wide steep lobes require attention setting the lifter depth where other perfomance cams are forgiving, V-Thunder 5000 series cams are easier on the valve train and get good results in a Evo. I don't know how you ride so I can't pinpoint a direction, a Woods cam can be dependable and bark when it's time for the dogs to come out but a W6 is brute torque that tends to fall off but will keep you out of 6000 rpm's and the bigger Woods like the W9 will pull until you here that rev limiter in the 6200-6400 range. Personally I run a W6H with S&S internals (stroker) with heads to match and a Wolf in Hogs body but dependable as all of the new Twinkies I run with so it is possible to have good street manors and leave this one alone status, the decision is up to the owner

Every now and then a professional will chime into the Evo section, other than that everyone is stuck with us goofballs but enough intelligence on here to help out in anyway - tech advice, tricks, moral support, spending your money, spending your money and spending your money - we are relentless in every phase

 

Thanks 97, Iv read you before and know you have good advice. I didnt mean to scare anyone off with the pro talk. I started to think it was my breath. I just came from my mech shop and layed dn $5oo dep for parts and tenatively we are going with a w6 cam & bearings, heads will be sent to a top secret builder thats been doing race heads all his life. Heads will be built & flowed for the cam & compression.Shaving the heads dn about .10 or so. New guides, over size valves & springs. adj pushrods, igniter, lifters. All surfaces touched up for the best gaskets money can buy. My 2 mechanics have about 60 years between them building 1/4 mi racers. I should have about 95 hp. Thats all a half dead old man needs. Should be a good everyday cruiser. Many thanks for the help.