engine and drivetrain Carb decisions....keep the 38/38 or dive into the DCOE 40s?

[M3M3]

I can't believe Marshall wasn't the search Nazi on this one, as we did this not so long ago.

 

it was sooooo tempting.  this topic has been beat to death repeatedly in the past.....   

[jrhone]

Yup, there is lots of archival info....BUT there are some new products and people that may have had more mileage on their setups and have more input.  Its rare someone goes back to a 2 year old thread to say Oh after a few years my problems have worked themselves out and I love it now, OR my wonderful setup that I loved originally now has me retuning weekly and its never right.  So asking the question again isn't always a bad thing...plus I love Marshall's input.

[Simeon]

38mm Keihin flat-slide motorcycle carbs that have been hogged out to 40mm, mated to the "Lynx" manifold. I ran these carbs on my "Pro-4" when I was racing circle track. I'm going to do the install after Brisbane and Bimmerfest

Of course there is one logical conclusion to this.

Get another pair of carbs! Do it!

[M3M3]

there are some new products

 

please excuse my indulgence JR..this is one softball i just can't resist...  

 

we are talking about a comparison of two 40 year old carb designs here...there is nothing new to be said!       

 

but KB's dyno video was worth the effort of the thread...unless he posted it before....

[jrhone]

OK...I'll toss another...lol

 

When did Ireland make their intakes?  40 years ago or just a few years?  Crane, MSD, Pertonix all have new products within the last 2 years that COULD have an effect on performance of either system, linkage systems that are new in the last few years, which people say is a VERY important part of DCOE setups, etc...  

 

Yes both carbs are old technology, but there may be new things that have an effect on the tuning and performance of both designs.  

[Doug Riparetti]

@Simeon; I had four of them at one time, but that was over 10-years ago, somehow,  one came up missing. So the Lynx made more sense, with a stock motor, and I still had three of the flat-slides already, just sitting, collecting dust. 

 

Here is a couple of photos of my Bro's car with the 4-44 Mikuni's round-slides on his circle track car

Edited April 25, 2015 by Doug Riparetti

[TobyB]

Gotta say,

the best thing about sidedrafts is when you have something you want to change, you adjust something, and they actually change. Kind of like you had hoped.

Plus, if you have all the bugs out, they do sound nice. And you can get them right, unlike the 38 that you can get close...

New? Yeah, maybe a nice new distributor with just the right curve. And a solid linkage you built out of new, high quality parts

Otherwise, new means EFI with a nice crankfired ignition. ...

t