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Main Section => Welcome to our virtual Pub Meeting ... => Topic started by: -OTTO- on November 23, 2019, 10:25:55 AM

Title: Motor Compression
Post by: -OTTO- on November 23, 2019, 10:25:55 AM

Hello all

I pleased to buy a motor with the number 151 123 907

the dealer said to me its a 8:1 compression
Am i wrong?
i thought all the time these motors are 7:1 compression

Thanks for brining light in my brain :stars

Title: Re: Motor Compression
Post by: Wittsend on November 23, 2019, 10:53:37 AM

Yes,
But a previous owner could have done anything ???

Title: Re: Motor Compression
Post by: -OTTO- on November 23, 2019, 10:57:53 AM

Thanks

so i have to look if there are
rightangular cast


kind regards

Title: Re: Motor Compression
Post by: Formerlyjeremy on November 23, 2019, 10:59:51 AM

The compression ratio may be lower for export vehicles - it'll depend on the quality of fuel likely to be available, if in doubt supply low compression vehicles.

Title: Re: Motor Compression
Post by: agg221 on November 23, 2019, 03:20:06 PM

Quote from: Formerlyjeremy on November 23, 2019, 10:59:51 AM

The compression ratio may be lower for export vehicles - it'll depend on the quality of fuel likely to be available, if in doubt supply low compression vehicles.

That would be if the head had been changed. The alternative is that the head could have been skimmed down to increase compression. No easy way to check this without taking it apart  ???

Alec

Title: Re: Motor Compression
Post by: Wittsend on November 23, 2019, 03:32:00 PM

The only way to be sure what you have is to measure the height of the head.

There is a recent topic on 9:1 compression heads and some head heights given.

Title: Re: Motor Compression
Post by: agg221 on November 23, 2019, 03:41:21 PM

Quote from: Wittsend on November 23, 2019, 03:32:00 PM

The only way to be sure what you have is to measure the height of the head.

There is a recent topic on 9:1 compression heads and some head heights given.

This thread:

https://www.series2club.co.uk/new_forum/index.php/topic,1268.msg13417.html#msg13417

but I would think you would need to take the head off to be confident of the measurement?

Alec