Oh lawdy lawwwdd

"YSI-what can brown do for you" (ysi-what-can-brown-do-for-you) 07/23/2014 at 10:44 • Filed to: None

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15

Oh look, twin distributors you know what that means.

I heard they were thinking about using a flat 16 for Can-am, but I didn't know they actually made one!

RamblinRover Luxury-Yacht > YSI-what can brown do for you 07/23/2014 at 10:52

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The BRM H16 is, of course, a bit more compact. Also two dizzies.

Neither is as pretty as a Jabiru 5100, though that has two dizzies for eight.

EL_ULY > YSI-what can brown do for you 07/23/2014 at 10:53

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WOWZERS!

YSI-what can brown do for you > RamblinRover Luxury-Yacht 07/23/2014 at 10:55

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Is that engine aircooled? Is it an airplane engine?

McMike > YSI-what can brown do for you 07/23/2014 at 10:56

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"Oh look, twin distributors you know what that means."

(raises hand) 32 spark plugs to gap.

RamblinRover Luxury-Yacht > YSI-what can brown do for you 07/23/2014 at 10:58

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Yep. Lycoming and Continental made boxer eights in much larger numbers than Jabiru, but there still aren't that many out there. I want to build a hot rod with an air-cooled boxer 8+ some day.

Pictured, a Lycoming:

YSI-what can brown do for you > RamblinRover Luxury-Yacht 07/23/2014 at 11:00

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Was it a true boxer 8 like the 908, or was it just a 180 degree V8?

YSI-what can brown do for you > McMike 07/23/2014 at 11:01

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Oh the joy it must be to change all those spark plugs out.

Cé hé sin > McMike 07/23/2014 at 11:01

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16 plugs? It's a flat 16.

Cé hé sin > YSI-what can brown do for you 07/23/2014 at 11:03

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The Jabiru has to have twin distributors and two plugs per cylinder because it's a plane engine. Each distributor powers one set of plugs.

YSI-what can brown do for you > Cé hé sin 07/23/2014 at 11:04

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Twin distributors, it means it has 2 plugs per cylinder! 32 in total!

RamblinRover Luxury-Yacht > YSI-what can brown do for you 07/23/2014 at 11:06

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The Jabiru 2200 (a flat four) was a true boxer, so I believe the 5100 was as well. The Lycoming IO 720, though...

Well, as you can see below, it's kind of neither. It's like a boxer with the pairs displaced from one another - pairs aren't opposite, but the engine still has individual journals. It's arguably most similar to a truncated/ half-offset straight eight.

RamblinRover Luxury-Yacht > Cé hé sin 07/23/2014 at 11:09

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Yes, but the Can-Am flat sixteen he has pictured has dual ignition as well - not for plane engine reasons, but probably for burn control. Count the dizzy leads - two 16-cylinder custom distributors. Absolutely absurd.

YSI-what can brown do for you > RamblinRover Luxury-Yacht 07/23/2014 at 11:12

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Oooo I have seen a picture of this crank before. I would say it is a boxer because it has individual pins, but it isn't exactly at the correct angles to be a boxer. I wonder if it needs both to be a boxer. Here is the Porsche's.

It is kind of hard to tell from the picture but it seems that the first 4 are set at 180 degree intervals, then a 90 degree angle between 4 and 5 and then 5-8 are at 180. . . don't know if that counts as a boxer. I am just guessing the angles though.

Cé hé sin > RamblinRover Luxury-Yacht 07/23/2014 at 11:13

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I've been trying to do a census of each distributor's leads and yes, there seem to be more than eight apiece.

The result was probably like the 917 where you had to pull the engine to change some of the plugs.

McMike > Cé hé sin 07/23/2014 at 11:18

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Nope, 32. Those Porsche motors had two plugs per cylinder.

Here's a 5.0l 12