Re: Derbi porting

Graham Motzing /
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The plug heat transfer thing is all about pre ignition, if you are getting pre-ignition or detonation (unlikely with stock) your temps will spike up, usually under high load. The electrode gets hot and either totally lights off the fuel or just makes it burn faster. That's what's kinda crazy about the whole heart range thing, it will actually speed up the rate that the fuel burns in the chamber in effect advancing your timing. In order for the fuel to burn it's got to absorb the latent heat of combustion so anytime you increase that heat you make it burn faster which has the same affect as advancing timing.

I haven't fucked with derbi much but when we were designing the derbi heads on the hobbit, we found those head shed heat really well. Seeing cht over 400 is pretty high for a derbi. But at the end of the day, cht really doesn't matter, look for scorching on the back side of your piston to know if you piston temps are actually too high. When we were messing with hobbit heads they could be 450+ cht and still happy clean piston just because the head sucks at getting rid of heat.

If everything else is perfectly tuned and you are just seriously making that much heat and power, you can switch to redline or maxima 927 or klotz beanol, those seem to have the highest temp stability. Anything with castor, and whatever crazy magic is happening with redline.

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Derbi portingTopic by: Wolf Wizard Wolf Wizard 08/24/21 09:08PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/24/21 10:47PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/25/21 01:16AM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/25/21 01:24AM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 08/24/21 10:54PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/25/21 01:18AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/25/21 01:15AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/25/21 10:19PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/25/21 10:42PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/25/21 11:19PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/25/21 11:24PM
  Re: Derbi portingRe: pat splat pat splat 08/26/21 02:18PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/26/21 03:57PM
  Re: Derbi portingRe: Alan Jackson Alan Jackson 08/26/21 04:43PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/26/21 11:58PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/27/21 12:13AM
  Re: Derbi portingRe: Alan Jackson Alan Jackson 08/27/21 02:18PM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 08/28/21 04:20PM
  Re: Derbi portingRe: Dirty30 Dillon Dirty30 Dillon 09/02/21 02:00PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/27/21 01:20AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/27/21 10:26PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/29/21 01:10AM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 08/29/21 01:27AM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 08/29/21 09:28AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/29/21 09:57AM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 08/29/21 12:24PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 08/29/21 02:05AM
  Re: Derbi portingRe: Emil Kniemel Emil Kniemel 09/02/21 12:16PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/21/21 07:45PM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 09/21/21 08:50PM
  Re: Derbi portingRe: Jose Castanon Jose Castanon 09/21/21 09:10PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/22/21 02:17AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/26/21 10:39PM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 09/26/21 11:24PM
  Re: Derbi portingRe: - Joe - - Joe - 09/27/21 09:16AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 12:01AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 01:02AM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 09/27/21 01:19AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 01:36AM
  Re: Derbi portingRe: * wormdirt * * wormdirt * 09/27/21 01:39AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 01:46AM
  Re: Derbi portingRe: MPB Andyrew MPB Andyrew 09/27/21 09:53AM
  Re: Derbi portingRe: EH FCC of the QCB EH FCC of the QCB 09/29/21 06:18AM
  Re: Derbi portingRe: Jacob Fulton Jacob Fulton 09/27/21 10:24AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 12:58PM
  Re: Derbi portingRe: Graham Motzing Graham Motzing 09/28/21 10:46AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/27/21 02:06PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/28/21 12:54AM
  Re: Derbi portingRe: pat splat pat splat 09/28/21 05:07AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/28/21 09:01AM
  Re: Derbi portingRe: pat splat pat splat 09/29/21 12:09AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 09/28/21 10:53AM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 10/08/21 11:33PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 10/09/21 01:24AM
  Re: Derbi portingRe: Totally normal JBOT Totally normal JBOT 10/09/21 12:25PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 10/09/21 01:07PM
  Re: Derbi portingRe: Totally normal JBOT Totally normal JBOT 10/09/21 01:18PM
  Re: Derbi portingRe: Totally normal JBOT Totally normal JBOT 10/09/21 01:22PM
  Re: Derbi portingRe: Wolf Wizard Wolf Wizard 10/09/21 06:21PM
  Re: Derbi portingRe: Totally normal JBOT Totally normal JBOT 10/09/21 08:43PM

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