Compression changes

Rink675 · 10-23-12, 09:24

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!

Noodles · 10-23-12, 16:37

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!

Rink675 · 10-23-12, 20:25

Quote:

Originally Posted by Noodles

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

MacBandit · 10-24-12, 00:58

Triumph offer two thinner head gaskets.

Rink675 · 10-24-12, 12:40

Quote:

Originally Posted by MacBandit

Triumph offer two thinner head gaskets.

Are either of those gaskets part of the Triumph race kit? Just curious for future part number reference.

MacBandit · 10-24-12, 13:00

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.

Rink675 · 10-24-12, 13:05

Quote:

Originally Posted by MacBandit

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!

jdgun_13 · 10-24-12, 13:15

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.

Rink675 · 10-24-12, 14:04

Quote:

Originally Posted by jdgun_13

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.

jdgun_13 · 10-25-12, 18:11

Quote:

Originally Posted by Rink675

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

10-23-12, 09:24	#1
Rink675 Senior Member Join Date: Aug 2012 Location: Minneapolis Posts: 754	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! __________________ 2007 Triumph 675 Race Bike
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10-23-12, 16:37	#2
Noodles Member Join Date: Jan 2012 Location: 20 min south of Mosport Posts: 403	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! __________________ Noodles Racing would like to thank the following sponsors for their support in the 2012 CSBK season: GP BIKES TRIUMPH, EUROCORSA PERFORMANCE (Bitubo suspension, Spidi leathers, Rizoma rearsets, Power Bronze windscreens), ARMOUR BODIES, MOTOAIRBAG CANADA, MOTOVAN, HINDLE EXHAUST. http://s21.photobucket.com/albums/b294/Noodles_771/
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10-24-12, 00:58	#4
MacBandit Senior Member Join Date: Sep 2008 Location: Seattle Posts: 7,628	Triumph offer two thinner head gaskets. __________________ http://www.triumphinstructions.com http://www.triumph.co.uk/uk/Handbooks.aspx http://www.rideatriumph.com/
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10-24-12, 13:00	#6
MacBandit Senior Member Join Date: Sep 2008 Location: Seattle Posts: 7,628	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. __________________ http://www.triumphinstructions.com http://www.triumph.co.uk/uk/Handbooks.aspx http://www.rideatriumph.com/
Status: Offline

10-24-12, 13:15	#8
jdgun_13 Senior Member Join Date: Apr 2010 Location: Fixing my own $hit! Posts: 1,431	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. __________________ 2005-ZX-6R 2011-675R Far to many mods to list 2012- RSV4 Aprc Factory
Status: Offline

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