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Keith=20
I did that in the 60s when I had my BN1- used Dodge pistons with the =
skirt cut off. Worked well with a lot shaved off the head so had water =
squirting out everywhere. Used to run 1 gallon of methyl-benzine with 4 =
gallons of super. When I rebuilt my present BN1 I got some flat tops =
from JP (or JE) pistons in Adelaide. I reckon it would be 10:1 or so, =
I=E2=80=99ve never really worked it out. With a Wade cam,1 =C2=BE =
SU=E2=80=99s (HD6s) & extractors it goes like the clappers. Torque is =
ridiculous and runs well on 95 ULP.=20
Both sets of pistons came to the top of the block. IIRC, the Dodge =
pistons had smaller gudgeon pins so they offset drilled the pistons =
because the standard ones would be below the top
Cheers
John Rowe
Qld
BN1 BT7
=20
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Keith =
Taylor
Sent: Saturday, 16 January 2016 2:04 PM
To: Wilko2
Cc: healeys
Subject: Re: [Healeys] +Compression ratio
=20
Thanks Bob & Rick I believe the pistons were from a Dodge "Q" & are not =
dished, they are level with the top of the block
They were fitted long before I bought the car & after rebuild I had to =
fit a high torque starter to get it to turnover=20
>From your assessments & my assumptions I thought compression would be =
higher than 9.5 possibly 10+
The car certainly has plenty of torque It also had an ugly/bizarre =
plumbing setup to the head similar to a 100S for cooling=20
=20
Curiosity satisfied=20
=20
Keith
=20
On 16 January 2016 at 12:57, Wilko2 <e-wilkins@cox.net> wrote:
The standard 7.5/1 piston has a dish top with a volume of 29 cc.
The LeMans 8.5/1 piston also has a dish top but the dish is not as deep =
being only 14cc volume. A true flat top if it has the same compression =
height (distance from the top of the pin hole to top of piston) would =
give a ratio of 10.5/1. There could be design variations that are flat =
top but have a lower compression height which would give a lower ratio.
Without knowing where the top of your piston is in relation to the top =
of the cylinder or dimension from pin, there's not way of knowing =
without measuring your chambers.
Rick Wilkins
On Jan 15, 2016, at 5:10 PM, Keith Taylor wrote:
> What would be the compression ratio of a BN2 fitted with flat top =
pistons.
>
> Keith Taylor
> BN1
> BN2
>
> Southern Highlands OZ
>=20
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-AU link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Keith <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>I did that in the 60s when I had my BN1- used Dodge pistons with the =
skirt cut off. Worked well with a lot shaved off the head so had water =
squirting out everywhere. Used to run 1 gallon of methyl-benzine with 4 =
gallons of super. When I rebuilt my present BN1 I got some flat tops =
from JP (or JE) pistons in Adelaide. I reckon it would be 10:1 or so, =
I=E2=80=99ve never really worked it out. With a Wade cam,1 =C2=BE =
SU=E2=80=99s (HD6s) & extractors it goes like the clappers. Torque =
is ridiculous and runs well on 95 ULP. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Both sets of pistons came to the top of the block. IIRC, the Dodge =
pistons had smaller gudgeon pins so they offset drilled the pistons =
because the standard ones would be below the top<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Cheers<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>John Rowe<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Qld<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>BN1 BT7<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Healeys =
[mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>Keith =
Taylor<br><b>Sent:</b> Saturday, 16 January 2016 2:04 PM<br><b>To:</b> =
Wilko2<br><b>Cc:</b> healeys<br><b>Subject:</b> Re: [Healeys] =
+Compression ratio<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal>Thanks Bob & Rick I believe the pistons were =
from a Dodge "Q" & are not dished, they are level with the =
top of the block<o:p></o:p></p></div><div><p class=3DMsoNormal>They were =
fitted long before I bought the car & after rebuild I had to fit a =
high torque starter to get it to turnover <o:p></o:p></p></div><div><p =
class=3DMsoNormal>From your assessments & my assumptions I thought =
compression would be higher than 9.5 possibly =
10+<o:p></o:p></p></div><div><p class=3DMsoNormal>The car certainly has =
plenty of torque It also had an ugly/bizarre plumbing setup =
to the head similar to a 100S for =
cooling <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Curiosity satisfied <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Keith<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>On 16 =
January 2016 at 12:57, Wilko2 <<a href=3D"mailto:e-wilkins@cox.net"; =
target=3D"_blank">e-wilkins@cox.net</a>> wrote:<o:p></o:p></p><p =
class=3DMsoNormal>The standard 7.5/1 piston has a dish top with a volume =
of 29 cc.<br><br>The LeMans 8.5/1 piston also has a dish top but the =
dish is not as deep being only 14cc volume. A true flat top if it has =
the same compression height (distance from the top of the pin hole to =
top of piston) would give a ratio of 10.5/1. There could be design =
variations that are flat top but have a lower compression height which =
would give a lower ratio.<br><br>Without knowing where the top of your =
piston is in relation to the top of the cylinder or dimension from pin, =
there's not way of knowing without measuring your chambers.<br><br>Rick =
Wilkins<o:p></o:p></p><div><div><p class=3DMsoNormal><br>On Jan 15, =
2016, at 5:10 PM, Keith Taylor wrote:<br><br>> What would be =
the compression ratio of a BN2 fitted with flat top =
pistons.<br>><br>> Keith Taylor<br>> BN1<br>> =
BN2<br>><br>> Southern Highlands OZ<o:p></o:p></p></div></div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'>> =
<o:p></o:p></p></div></div></div></body></html>
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