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South_Oz



Nombre de messages : 2
Localisation : australia
Date d'inscription : 07/07/2013

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MessageSujet: Squish Volume   Squish Volume Icon_minitimeSam 12 Mar 2016 - 2:49

I am wondering if squish volume should be taken into account when calculating head volume?

My thinking is that in theory there should be zero clearance between the piston and head in the squish area at full revs. Squish volume is around 2cc with 0.8 squish clearance. So a head with 10.5cc with plug in is really 8.5cc with engine up to operating temp at peak RPM?

All measurement taken with a 56mm bore.

Thanx

Dave
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Frits Overmars

Frits Overmars

Nombre de messages : 2251
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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MessageSujet: Re: Squish Volume   Squish Volume Icon_minitimeSam 12 Mar 2016 - 8:10

Good question Dave. Experience teaches us that we need a minimum squish gap of about 1% of the stroke; that is the amount the piston comes nearer the head at high revs. Of course it depends on the revs themselves, on the stiffness of the crankshaft and on the type of crankshaft bearing, but the 1% is a good average value.
Therefore I subtract a volume corresponding to 1% of the stroke from the static combustion volume when calculation the compression ratio in my engine simulation program.

Now how about a little introduction? Who are you, what are your hobbies, etc?
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South_Oz



Nombre de messages : 2
Localisation : australia
Date d'inscription : 07/07/2013

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MessageSujet: Re: Squish Volume   Squish Volume Icon_minitimeSam 12 Mar 2016 - 9:34

Hi Frits, thanx for your response. I race a Suzuki RGV 250 at Lake Gairdner in South Australia. So far my best speed has been 140 MPH (225 KPH) average over a flying mile on 98 octane gasoline.

The last 2 years I have changed to the Fuel class and have run Methanol with limited success. Im going to change to E85 for next year. The reason for my question is that im trying to design some heads to run E85 on. I used some modified RGV SP heads to run the Methanol but the compression was too much so it wouldnt rev as much as I would have liked. I used some heads that Lozza designed for me to run on gasoline, they worked fine but I have reached the maximum output of those as they are distorting and the O ring shows signs of blowing out. I like to do as much as I can, as cheaply as I can so want to modify the heads that I used for Methanol to run on E85.
A friend has a set of Jolly Moto pipes and was good enough to measure them for me so I put the measurements into MOTA and made a few adjustments to them so they give a bit better top at the expense of mid range and made a set for myself.
Im going to work on the aerodynamics of the bike as well for next year, my goal is 150 MPH (250KPH)

Thanx again Dave

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2T4T



Nombre de messages : 4
Localisation : Essonne
Date d'inscription : 17/01/2010

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MessageSujet: Re: Squish Volume   Squish Volume Icon_minitimeDim 13 Mar 2016 - 22:49

Hello ,

Very good question South_Oz.

Can we assume that squish height drop by square of engine rev due to inertial forces ?
If piston "hit" head at 14500rpm , could we say that squish height is around 1% - (13000/14500)^2 = 0.2% ?
This could conduct to a 0.15 - 0.2mm squish gap for a RSA and a twice the "static" MSV calc @ 13000rpm ?

Does a so high MSV may help ?

Thanks and regards
Alain
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