pistons - Page 2

rogerthechorister · Apr 5th, 2016, 22:55

Whack a starter on yours, put some plus-gas down the (empty) spark plug holes, get a mate to hold onto it, jump leads and give it a wind to check the CR. It's exactly what the local garage did to my spare engine when my daughter melted my B234F.

crogthomas · Apr 6th, 2016, 09:42

Using a compression tester on an engine won't tell you the static compression ratio, only that the engine is dynamically able to compress air without leakage. The static compression ratio has to be very carefully calculated from the relative volumes of the cylinder and the combustion chamber.

I've measured an actual 760 B230ET engine to have a compression ratio of 9:1.

rogerthechorister · Apr 6th, 2016, 10:13

My B234F engine was closer to spec than that.

360beast · Apr 7th, 2016, 07:00

Quote:

Originally Posted by GreenBrick

How much would you give for the pistons?

The engine is coming out this weekend, tempted to make the block it into a coffee table or wine rack.

Sorry I didn't see your post until now.

How much do you want for them? I don't make offers without knowing how much sellers want to start with.

Apr 5th, 2016, 22:55	#11
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Starter Whack a starter on yours, put some plus-gas down the (empty) spark plug holes, get a mate to hold onto it, jump leads and give it a wind to check the CR. It's exactly what the local garage did to my spare engine when my daughter melted my B234F. __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Apr 6th, 2016, 10:13	#13
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Odd My B234F engine was closer to spec than that. __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Apr 6th, 2016, 09:42	#12
crogthomas Master Member Last Online: Apr 23rd, 2024 08:24 Join Date: Jan 2008 Location: Bracknell, Berkshire, UK	Using a compression tester on an engine won't tell you the static compression ratio, only that the engine is dynamically able to compress air without leakage. The static compression ratio has to be very carefully calculated from the relative volumes of the cylinder and the combustion chamber. I've measured an actual 760 B230ET engine to have a compression ratio of 9:1.

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