Jump to content


Photo

Racing V8s


  • Please log in to reply
55 replies to this topic

#51 MatsNorway

MatsNorway
  • Member

  • 2,086 posts
  • Joined: December 09

Posted 27 September 2012 - 15:54

i don`t now stuff like you guys do but i know compression to be a big hp gain.

if you look at R bikes and the CR up to today. they have gone from 130-150hp in the year 2002ish to 180-190 today.

11:1 around vs 13:1
http://www.motorbike..._1000_2002.aspx
http://www.bikez.com...-r1000_2012.php

that and some minor rpm gains. (that said i think that gain is due to CR)

There are ofc more in the background like better injection, cam systems and intake tech but thats minor details?


Edited by MatsNorway, 27 September 2012 - 15:56.


Advertisement

#52 Lee Nicolle

Lee Nicolle
  • Member

  • 6,249 posts
  • Joined: July 08

Posted 29 September 2012 - 05:18

Des - I am not exactly sure what you are saying ("specific torque metric?") but I think BMEPs and thermal efficiencies have improved enormously since the "early/mid 20th century". TE/BMEP is linked directly to the compression ratio and typically early/mid 20th century CRs were in the 5:1 to 8:1 range - now they are around 10:1.
I had a 1937 Austin 7 Ruby which I think was 5:1 CR. It would refuse to start if the petrol was a few weeks old.

I have a 2003 Falcon that is the same!! That is a comment on the crap quality fuel however!
Actually A7s like a bit more compression too but the bent paperclip they use for a crank does not like it much, nor too many more RPM.
Though put all the good bits in them and they can be a healthy little beast for their age,,, except most of the components are decades newer.

#53 mariner

mariner
  • Member

  • 1,407 posts
  • Joined: January 07

Posted 01 October 2012 - 10:20

Not quite on topic but if you want a REALLY large capacity dual overhead cam V-8 then Ford was building thousands of them in the 1940's

http://home.windstre...wl/Sherman.html

Now - question to Magoo - is there any evidence of one going into a road or race car - surely one of those at war surplus prices would have tempted some hot rodder somewhere

#54 Kelpiecross

Kelpiecross
  • Member

  • 943 posts
  • Joined: October 10

Posted 01 October 2012 - 13:52

Not quite on topic but if you want a REALLY large capacity dual overhead cam V-8 then Ford was building thousands of them in the 1940's

http://home.windstre...wl/Sherman.html

Now - question to Magoo - is there any evidence of one going into a road or race car - surely one of those at war surplus prices would have tempted some hot rodder somewhere


I think I have seen on You Tube recently one of those engines fitted to a Mustang.

#55 Lee Nicolle

Lee Nicolle
  • Member

  • 6,249 posts
  • Joined: July 08

Posted 05 October 2012 - 08:59

Fred Duece I think has it on here or TNF somewhere too in [or on] the 70 Mustang

#56 Magoo

Magoo
  • Member

  • 2,554 posts
  • Joined: October 10

Posted 06 October 2012 - 11:54

Not quite on topic but if you want a REALLY large capacity dual overhead cam V-8 then Ford was building thousands of them in the 1940's

http://home.windstre...wl/Sherman.html

Now - question to Magoo - is there any evidence of one going into a road or race car - surely one of those at war surplus prices would have tempted some hot rodder somewhere


There's not much more to add beyond what has already been supplied.