Post by
bluebirdspecial »
https://forums.nicoclub.com/bluebirdspecial-u14016.html
Sat Feb 28, 2004 3:30 pm
I will probably go out to Northridge (Fairlady Products) this Friday and try to collect anything that Napa doesn't have.They have a huge site and I believe Fairlady Products and Rallye Ent. ARE the Roadster biz. They at least should have the cans of Datsun Blue for that little final touch on the engine. If anything in the car will be stock it will be the engine (at least for phase 1). Also anyone have any thoughts about what size muffler and where should it go. I was running a straight 2 inch pipe, from right behind the lower exhaust flange that was right before the resonator, to a $20 Pomona Special 2 inch "Turbo Muffler". Now I am torn because I know small engines love backpressure because of valve float (right?), but all of the engines that this logic is referenced on are OHC whereas the J13 is OHC, just like a the BMC b-series that it is derived from. I have looked and found nothing based on the almighty dyno when it comes to the OHV inline 4. I have never really driven anything except OHC even my Ford was OHC. Right now I am leaning towards a 1.75" muffler (right in front of the rear axle) with a same size pipe coming from what I think is a 1.5" pipe at the flange. Would that be enough backpressure to keep those nasty exhaust gases from returning to the cylinder? I want nice flat power and the car rarely sees the freeway . Is this the way to go? I don't know.