RCCanada - Canada Radio Controlled Hobby Forum - View Single Post

meloni · 06-20-2014, 03:47 AM

YEs, two days ago I talked with Michal (ZDZ sales man).... he told me he wanted to talk with JMB about exhoust options but I'm still waiting for an answer. later today I'll try to call him again.

Meanwhile I tested the engine @ 18,75 inches total lenght and I got 100 extra RPM compared to the 19,1 inches test ( at 18,75 I got 5410 rpm and a nice spoolup).

After several minutes of cool down I removed another 10mm and tested at about 18,3 inches total lenght. this time I got 5400 rpm and maybe a hair worse transition.

Now I want to let the engine cool down a bit and shorten even more the headers just to make sure I past the "peak point". In case the performances drop even more, I'll test 5mm shorter and 5mm longer (a hair less than 1/4 inch) than 18,75 inches.

06-20-2014, 03:47 AM	#96
meloni RCC Contributor I am: Daniele Meloni Join Date: Dec 2009 Location: Old Italy!! Feedback: 0 / 0% Posts: 250 Total Props: 1	Re: ZDZ224 testing YEs, two days ago I talked with Michal (ZDZ sales man).... he told me he wanted to talk with JMB about exhoust options but I'm still waiting for an answer. later today I'll try to call him again. Meanwhile I tested the engine @ 18,75 inches total lenght and I got 100 extra RPM compared to the 19,1 inches test ( at 18,75 I got 5410 rpm and a nice spoolup). After several minutes of cool down I removed another 10mm and tested at about 18,3 inches total lenght. this time I got 5400 rpm and maybe a hair worse transition. Now I want to let the engine cool down a bit and shorten even more the headers just to make sure I past the "peak point". In case the performances drop even more, I'll test 5mm shorter and 5mm longer (a hair less than 1/4 inch) than 18,75 inches. __________________ Proud member of the Eastern Mafia™ Last edited by meloni; 06-20-2014 at 03:55 AM.