DRLA Tuning

[Steve C]

I'm running dual 36 DRLAs on a 1776 and need to rebuild them. I'm going to get the rebuild kits from that guy in Italy and need to know what size inlet valve I should be running. I'm considering .250. Is there any problem to using a larger inlet valve? I've got the Superformance book and can't find much info pertaining to inlet valve selection. Any help is appreciated. Thanks.

[Bruce Tweddle]

Nooooo!

A 150 is plenty big enough.

Going too big will make it difficult for the fuel level to remain at a precise level.

[Steve C]

That's the info I needed. Would a 150 be plenty for a 1910 T4 as well? Thanks for your help!

[Bruce Tweddle]

A 150 is all that some 36s need.
An engine with small carbs like those, doesn't consume fuel at a very fast rate compared to a bigger engine with 48 DRLAs.  That's why you can use the smaller inlet valve.
A second advantage 36s have is that the float chamber is the same size as what's in a 48 DRLA.  That means if your pump quits, you can drive farther.  IOW, you have a relatively larger reservoir with your 36s.

[KAFUR1]

pre tune them before you put them on and you'll get  a better tune !