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Old 10-23-12, 09:24   #1
Rink675
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Default Compression changes

I was watching the 675cc expert evening videos on youtube and it caught my attention on how the triples love compression. How much compression can you run on a stock engine (2007) without having to use race gas?

Is it just a matter of swapping the head gasket to a thinner gasket or would the surface of the head have to be machined down plus a thinner gasket? I know you could do both but if it was just a matter of swapping out the gasket and tuning changes for the new compression that would be great!
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Old 10-23-12, 16:37   #2
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One thing to consider when changing to a thinner head gasket is that you achieve proper squish clearance. You can safely mill .006"-.007" off the head and still run premium pump fuel. Keep in mind that you may want to add adjustable cam sprockets after to get your cams in time. By going to the thinner gasket and milling the head you could become quite retarted (the cam timing, that is).

Nuno!
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Old 10-23-12, 20:25   #3
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Originally Posted by Noodles View Post
One thing to consider when changing to a thinner head gasket is that you achieve proper squish clearance. You can safely mill .006"-.007" off the head and still run premium pump fuel. Keep in mind that you may want to add adjustable cam sprockets after to get your cams in time. By going to the thinner gasket and milling the head you could become quite retarted (the cam timing, that is).

Nuno!

lol gotcha! Thanks for the info
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Old 10-24-12, 00:58   #4
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Triumph offer two thinner head gaskets.
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Old 10-24-12, 12:40   #5
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Triumph offer two thinner head gaskets.

Are either of those gaskets part of the Triumph race kit? Just curious for future part number reference.
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Old 10-24-12, 13:00   #6
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The kit is a isn't really a kit. Triumph offers a large number of race parts that are all designed to work together thus the term 'kit', but they are sold individually. Yes both gaskets are in Triumph racing parts catalog.
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Old 10-24-12, 13:05   #7
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The kit is a isn't really a kit. Triumph offers a large number of race parts that are all designed to work together thus the term 'kit', but they are sold individually. Yes both gaskets are in Triumph racing parts catalog.

Oh ok, thanks for the info!
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Old 10-24-12, 13:15   #8
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Like yourself watched the 1st installment the other day...
I thinki will be going ahead and doing a supersport head from TRIPP & a thinner headgasket, then custom tune.

Even with the full system TUNE ECU map, the mods i have on the bike prefer 89 octane for sure... I really need to get that O2 bung welded on my pipe to run the Bazzaz AFM.
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Old 10-24-12, 14:04   #9
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Originally Posted by jdgun_13 View Post
Like yourself watched the 1st installment the other day...
I thinki will be going ahead and doing a supersport head from TRIPP & a thinner headgasket, then custom tune.

Even with the full system TUNE ECU map, the mods i have on the bike prefer 89 octane for sure... I really need to get that O2 bung welded on my pipe to run the Bazzaz AFM.

What is involved on the head work? Just clean up the ports and match them to the exhaust header? Do you have the triumph race ecu? This bike has that and I am still a little confused on the difference between using tune boy with race ecu's and all of this other tuning stuff.

With cars you just have 1 single external controller and the CMR software would change everything you needed. This is a little more confusing then what I am used to.
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Old 10-25-12, 18:11   #10
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What is involved on the head work? Just clean up the ports and match them to the exhaust header? Do you have the triumph race ecu? This bike has that and I am still a little confused on the difference between using tune boy with race ecu's and all of this other tuning stuff.
The stock ECU is Re-writeable... thus the Tune ECU (multiple maps for mod on the web)
I have Bazzaz that i will be using over the tune ECU fuel maps, once i have the bike back in Oregon.
For the head, based off my discussion with TRIPP they are going to deck the head (shave it down .005-.007) clean up the valve guide area & chamber, 5 angle valve job and thats it.
from my understanding the ports are pretty big and dont need much for changes.
given i have Never had a 675 apart, so i am not master on it by any means.
Ask me about a 05-06 6R thats a whole different story..

Ask TJ from riders discount or call Tripp or hord racing, about the KIT ECU they for sure can help you out more than i can.
http://www.hordpower.com/
http://www.power-tripp.com/Tuning.html
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