MKI / MKII S type 240 340 & Daimler 1955 - 1967

240 engines - various compression rates?

 
  #1  
Old 11-19-2018, 07:01 AM
Lambretta's Avatar
Member
Thread Starter
Join Date: Nov 2018
Location: Athens
Posts: 37
Received 5 Likes on 3 Posts
Default 240 engines - various compression rates?

Hi all
On the engine numbers I read: "Note: Suffix of /7 or /8 to the engine number denotes compression ratio."
So, all the 240s came with an "8" compression rate on their engines or there have been also some cars with "7"?
What's the difference in practice between 7 and 8?
Cheers,
Nassos
 
  #2  
Old 11-19-2018, 07:20 AM
Glyn M Ruck's Avatar
Senior Member
Join Date: Jul 2012
Location: Llandudno, Cape Town, South Africa
Posts: 515
Received 85 Likes on 74 Posts
Default

It's all in the pistons on a Jag & fuel availability in different markets. The higher the compression ratio the higher the performance but also the higher the propensity for knock, pre ignition, detonation, pinging by whatever term you know it. Jaguar built 7 to 1 CR engines for poor fuel markets where only low octane fuel was available. 8 to 1 CR was the most common. They built engines with all 3 compression ratios.


 

Last edited by Glyn M Ruck; 11-19-2018 at 07:26 AM.
The following users liked this post:
Lambretta (11-19-2018)
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Davd H
UK & Eire
0
12-29-2013 02:18 PM
jawdoc
MKI / MKII S type 240 340 & Daimler
1
12-07-2012 12:07 PM
benjamachine
MKI / MKII S type 240 340 & Daimler
0
11-21-2012 09:56 AM
FrenchJagman
MKI / MKII S type 240 340 & Daimler
5
10-19-2011 04:00 AM
Big Worm
S-Type / S type R Supercharged V8 ( X200 )
5
11-20-2009 11:12 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: 240 engines - various compression rates?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: