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· Premium Member
3,178 Posts
Discussion Starter · #1 ·
here's a "report" i e-mailed to the lists...

i get in my heads from Guy Martin and he's got me working hard already.
well, i guess it's fair, since i sent him the crap 750 heads that he had to
not only work his usual magic upon, but also convert them to 900 spec
combustion chambers!

i've actually never arsed to degree cams before. i alllmost did it to my
former 916 when i was about to build it to the hilt, but i ended up racing
an Aprilia RS250 instead. so now, i break out the "6 jewel" dial indicator i
bought for the degreeing task some 3 years ago and set out to figure how to
measure the valve lift...

this above picture shows how i fabbed up some 3/4" aluminum bar to hold the
dial indicator where i was holding it by hand figuring that would work. you
can also see the "foot" attached to the bottom of the dial indicator which
catches on the lip of the closing shim. i probably could or should have use
1/2" square aluminum bar, but the 3/4" stuff was laying around, so i grabbed
it and used it. tools i used were: 3/8" carbide end mill, 3/4" carbide end
mill, 6mm counter bore, #9 drill bit, 6x1.0 mm tap.

here's another view:

the blocks are pretty simple save for trying to figure out and then setup
the 39 degree relief in the bar mounted to the head. btw, the top bolt holes
are 58mm apart. oh, and on this picture, you see the requisite external oil
feed. yeah, Guy "digs for oil" when reworking the intake ports, so we get to
run external oil lines.

the next thing i did was to play with the cam and watch the dial gauge work.
hmm... one revolution (for .100" lift)... two... three... four (f_ck!) ...
and it crossed over while somewhere between .400 and .500" of lift! turns
out that the ST2 cams have .460" of lift!

note that in the pic, while opening, the dial gauge is turning anti
clockwise, so you look at the little numbers... it's pointing at the 60!
also notice to the right how far open the valve is.

in this above pic, you're looking down the intake port... and the line of
sight is above the deck of the head and you can still see valve sticking out
below the head!

here's the dinner plate pic. the intake valve is 1.77" across. effing HUGE.
in the bottom right corner, you see the set screw that is blocking the oil
passage. it is amazing how Guy glued a dinner plate to the valve stem!

i'm pretty anxious to get the engine installed and dyno'd but i'm waiting on
some studs... i've got something in the works, so i'll likely be first thing
after the holidays for that. in the meantime, i'll be able to set the cam
timing and clay the clearances. i was kinda waiting for the new voodoo cycle
cat engine stand, but i guess they got delayed... :)

:) chris

Hi Cris. I know Guy Martin a little. I've met him at Mosport last summer and he tought me about flwing heads. Yours seems really worked. I am considering this kind of job in a near future. Please answer this: How much did he charge you for a job like this? :D

· Premium Member
3,178 Posts
Discussion Starter · #3 ·
hi quebec_monstro,

Guy is offering that work to the 900 heads for US$2350 (see below). $500 more to convert 750 "hemi" combustion chamber to 900 "bathtub" style. then you will need to get the FCR "singles", too. this may be a touch preliminary, but Guy and i are in talks to have partnership. i will handle US market and arrange for the parts shipping to Guy and then he will do the work. since you're in Canada, you would work directly with him. anyhow, that price is what we were talking about to offer to the US market.

while that price isn't a whole lot, the real expensive part is the "while you're in there costs" like new pistons ($300~400) bore and replate (~$450), and the FCRs (~$900).

:) chris

· Premium Member
2,773 Posts
Cool post Chris!

Thanks for the info. I'm happy to hear about the potential partnering with Guy. But now I've got wheels turning in my head again about spending money again. Oh well, when something needs rebuilding - time to upgrade ;D

So those valves can actually get by each other, eh? HUGE.

Love the little avatar pic under your name! Excellent work on the indicator mount.

· Premium Member
3,178 Posts
Discussion Starter · #6 ·
hi Mark, hhehehe :D yeah, i came up with the avatar after a different bbs essentially requires people to have avatars and the generic one stayed broken all the time.

the real beauty of Guy's work is that he can "uncrap" the crap 750 heads on `97 M900s!!! i have some goofy plans for this product line... hehehe, since i always liken engine mods to an "arms race", what would be the weapon to end all arms races?? ;) anyway, i'll have to write up some serious propaganda... and some of it will show the false economy of the incremental building of your "arms". if you want to go big, start big. this is big.

:) chris
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