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 corrected compression ratio

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3 participants
AuteurMessage
aljaxon

aljaxon


Nombre de messages : 68
Age : 97
Localisation : United Kingdom
Date d'inscription : 16/11/2022

corrected compression ratio Empty
MessageSujet: corrected compression ratio   corrected compression ratio Icon_minitimeMar 25 Juil 2023 - 18:30

what is a nice corrected compression ratio that will allow the motor to rev high and run cool and still produce decent power. i know there is no direct correlation to psi but i find running at 135 psi i get all the above. 150 i get more power but temps start to rise.

the motor in question is aircooled and is for street use.
i am sure before today i have aimed for 6:1 when calculating my head volume but cant remember due to old age.
thanks
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JanBros




Nombre de messages : 362
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMar 25 Juil 2023 - 22:41

corrected compression ratio is useless.
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Frits Overmars

Frits Overmars


Nombre de messages : 2637
Age : 76
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMar 25 Juil 2023 - 23:02

JanBros a écrit:
corrected compression ratio  is useless.
corrected compression ratio 241515
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aljaxon

aljaxon


Nombre de messages : 68
Age : 97
Localisation : United Kingdom
Date d'inscription : 16/11/2022

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 0:39

JanBros a écrit:
corrected compression ratio is useless.

isnt it a good rule of thumb guide so as to achieve the desired psi?

ie its impossible to test the psi of a head whilst its on the bench but its easy to burette it to get the desired volume.


one of your spreadsheet pages refers to it ??
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JanBros




Nombre de messages : 362
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 8:39

aljaxon a écrit:
JanBros a écrit:
corrected compression ratio is useless.

isnt it a good rule of thumb guide so as to achieve the desired psi?

ie its impossible to test the psi of a head whilst its on the bench but its easy to burette it to get the desired volume.


one of your spreadsheet pages refers to it ??

because some people (like you) keep using it, I've put it in but have never looked at it
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aljaxon

aljaxon


Nombre de messages : 68
Age : 97
Localisation : United Kingdom
Date d'inscription : 16/11/2022

corrected compression ratio Empty
MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 9:15

well i wouldnt call it useless. if only to get the desired volume of the head somewhere in the right place. otherwise how the hell do you know how large to machine it?
or are you implying uncorrected compression ratio is the one to use to determine the head volume?

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JanBros




Nombre de messages : 362
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 12:18

what does the position of the piston have to do with determining the head volume ? if you want to measure it with fluids, the only position that matters is TDC.
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aljaxon

aljaxon


Nombre de messages : 68
Age : 97
Localisation : United Kingdom
Date d'inscription : 16/11/2022

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MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 13:17

JanBros a écrit:
what does the position of the piston have to do with determining the head volume ? if you want to measure it with fluids, the only position that matters is TDC.

i need to know what cc to machine the head to.
luckily by trial and error i now know what cc to make it. but i thought using the ccr formula would help me get the cc's without guesswork.

its looking like a ccr of 5.9 will lead to 8.1cc and cool running.
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JanBros




Nombre de messages : 362
Localisation : Belgique
Date d'inscription : 05/12/2011

corrected compression ratio Empty
MessageSujet: Re: corrected compression ratio   corrected compression ratio Icon_minitimeMer 26 Juil 2023 - 13:39

aljaxon a écrit:
JanBros a écrit:
what does the position of the piston have to do with determining the head volume ? if you want to measure it with fluids, the only position that matters is TDC.

i need to know what cc to machine the head to.
luckily by trial and error i now know what cc to make it. but i thought using the ccr formula would help me get the cc's without guesswork.

no formula or spreadsheet or sim is ever going to tell you what it should be. it's all about playing with it and testing. and than play some more and test some more.

and with more experience, you will have to play and experiment less to get the desired result.
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