Re: E50 + high (and adjustable) compression - spark plug = ....?

J MR /
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With my current aluminum combustion chamber, the compression ratio is adjustable up to about 18:1. That's the 'trapped' compression ratio after the exhaust port fully closes. The overall CR between BDC and TDC is adjustable up to about 27:1.

I suspect the 18:1 'true' CR is not high enough to burn pump diesel, so I think a new, smaller, cast-iron combustion chamber will be one of the next parts I make.

I may, alternatively (or additionally), add some diethyl ether to my diesel; the autoignition temperature for diesel is 410F, whereas it's only 320F for ether, so it should be able to run at a lower CR.

I'm a bit worried about going to a full cast-iron piston for vibration reasons. Don't really want to chop up my brand new race crank to alter the balance factor, so I'm hoping that I can get it to fire up with the changes I describe above before having to remake a piston.

Highest stressed components probably won't be the case bolts, so no need to do anything drastic like welding them shut. Pressure spikes in there won't be much different than a regular 2T motor. Thing I'm a bit worried about is the head bolts stretching, causing a leak at the head/cylinder interface. I drilled out the cases for larger bolts in hopes to mitigate some of those issues.

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Subject Written By Posted
  E50 + high (and adjustable) compression - spark plug = ....?Topic by: J MR J MR 11/14/19 05:01PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/14/19 05:03PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Angry Hipster Angry Hipster 11/14/19 05:56PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Ryan Graeme Ryan Graeme 11/15/19 12:17AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: pat splat pat splat 11/15/19 07:07AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/15/19 08:00AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Max (ツ) Max (ツ) 11/15/19 08:14AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/15/19 08:27AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/15/19 08:57AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: * * * * 11/16/19 01:21AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Angry Hipster Angry Hipster 11/15/19 08:58AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/15/19 11:53PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Dirty30 Dillon Dirty30 Dillon 11/15/19 09:09AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Jeff Parr Jeff Parr 11/15/19 07:48PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/15/19 11:55PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Ryan Graeme Ryan Graeme 11/16/19 12:57AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: noah adelstein noah adelstein 11/16/19 12:05PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: river 2strokes river 2strokes 11/30/19 03:32PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: discontinuuity _ discontinuuity _ 11/16/19 03:48PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Kevin Bishop Kevin Bishop 11/23/19 03:55PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: discontinuuity _ discontinuuity _ 11/23/19 04:17PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: J MR J MR 11/25/19 09:25AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Jeff Parr Jeff Parr 11/25/19 07:20PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Graham Motzing Graham Motzing 12/01/19 10:27AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Blaine- The artist formerly known as Plumber Crack "(OFMC)" Blaine- The artist formerly known as Plumber Crack "(OFMC)" 12/20/19 08:49AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: * * * * 12/20/19 07:37PM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Blaine- The artist formerly known as Plumber Crack "(OFMC)" Blaine- The artist formerly known as Plumber Crack "(OFMC)" 12/21/19 01:25AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: * * * * 12/21/19 02:20AM
  Re: E50 + high (and adjustable) compression - spark plug = ....?Re: Blaine- The artist formerly known as Plumber Crack "(OFMC)" Blaine- The artist formerly known as Plumber Crack "(OFMC)" 12/21/19 03:02AM

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