dome size question
Moderator: rztom
- two-stroke-brit
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- Posts: 1701
- Joined: Fri Nov 22, 2013 10:49 pm
- Location: Houston texas
dome size question
Hi All
how do i work out what cc dome i need to use with a cool head for my athena 392 setup.
i have athena head but the squish is about 1.5mm
i would like to get a cool head but unsure what size cc dome to get
thanks mark
how do i work out what cc dome i need to use with a cool head for my athena 392 setup.
i have athena head but the squish is about 1.5mm
i would like to get a cool head but unsure what size cc dome to get
thanks mark
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
Re: dome size question
Depends on your gas.
Skim whatever you get to 0.8 to 1mm and then measure the com with fork oil in a syringe.
Skim whatever you get to 0.8 to 1mm and then measure the com with fork oil in a syringe.
496 Cheetah. TSS PVs, PWK35s, Ignitech, RGV(ish) chassis
- two-stroke-brit
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- Posts: 1701
- Joined: Fri Nov 22, 2013 10:49 pm
- Location: Houston texas
Re: dome size question
i will be running "E" free gas which i think is 93 octane.
thanks mark
thanks mark
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
- T.RexRacing
- Posts: 1318
- Joined: Fri Nov 01, 2013 8:34 pm
- Location: back in the hills
Re: dome size question
Octane is octane regardless of ethanol content. Tuning requirements are different by a little but the resistance to detonation is 93 octane ethanol or not.
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali
Salvador Dali
- two-stroke-brit
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- Joined: Fri Nov 22, 2013 10:49 pm
- Location: Houston texas
Re: dome size question
thanks for that.T.RexRacing wrote:Octane is octane regardless of ethanol content. Tuning requirements are different by a little but the resistance to detonation is 93 octane ethanol or not.
any recommendations for dome capacity size
thanks mark
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
Re: dome size question
I'm thinking of putting a replaceable-dome head on my Canadian-spec RD-350, and have wondered the same thing.... which dome is right? Didn't the head come with some information, or perhaps a call to the company would be worthwhile? Keep us posted, please.
89 Canadian Spec RD-350
2013 BMW R1200RT
2007 Harley XL1200C Sportster
2008 Ducati 1098R
2015 Gas Gas 300 Trials bike
1972 Turbo-Charged 240Z
Zastava Black Arrow .50 BMG
2013 BMW R1200RT
2007 Harley XL1200C Sportster
2008 Ducati 1098R
2015 Gas Gas 300 Trials bike
1972 Turbo-Charged 240Z
Zastava Black Arrow .50 BMG
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- Posts: 1373
- Joined: Tue Nov 12, 2013 2:34 am
Re: dome size question
How do these heads work? As in, is the dome itself determining squish or is the head? I would assume the dome but I don't know. If dome, you would think you could buy a different shaped chamber with a specific cc for your octane. It seems crazy people have to skim the domes themselves when they come from the aftermarket 'performance' company but I suppose at the same time the road, crank, and piston will impact the squish. Just curious.
- T.RexRacing
- Posts: 1318
- Joined: Fri Nov 01, 2013 8:34 pm
- Location: back in the hills
Re: dome size question
I'd prefer a custom chamber made by the guy who ported it. OTS stuff has too many variables and compromise.
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali
Salvador Dali
- two-stroke-brit
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- Joined: Fri Nov 22, 2013 10:49 pm
- Location: Houston texas
Re: dome size question
yes the dome sets the squish dim.evan_calgary wrote:How do these heads work? As in, is the dome itself determining squish or is the head? I would assume the dome but I don't know. If dome, you would think you could buy a different shaped chamber with a specific cc for your octane. It seems crazy people have to skim the domes themselves when they come from the aftermarket 'performance' company but I suppose at the same time the road, crank, and piston will impact the squish. Just curious.
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
She might not be pretty but she will always be a fun ride
1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600