13BTOY

iTrader: (1)

Just wondering waht rpms should a carburated streetport idle at. Mine doesnt seems to want to idle at 1200 and nothing lower. I tried to lower it and it just wants to stall.


Thanks, Ed

Alex-7

Mine Idles loopyish at about 1k. I keep it happy at about 1100-1200

Hades12

I am with alex-7, Once warm 1k is about right and can be pushed down to 900.

Xavier8

sounds exactly right to me, somewhere between 900-1100 with holley 465. Mine will idle lower, but it tends to load up when sitting at lights.

Jeff20B

iTrader: (13)

Mine will idle with a few blips at 900 or so.

13BTOY

iTrader: (1)

Thanks for the info guys!


Ed

13BTOY

iTrader: (1)

By the way anyone running a 4port 13B?


Thanks, Ed

steve84GS TII

My S5 4-port 13BT streetport, idles rock solid at 800 or even lower.
Passes idle-2500RPM smog tests, too.EFI makes it easier to do both,I guess......

Jaime Enriquez

My Weber IDA-fed 13B likes 1100-1200...keeps the oil pressure up too.

IanS

iTrader: (4)

My 12A can idle at 500 smoothly, but I usually keep it at ~900

13BTOY

iTrader: (1)

I guess every motor is different. My streetported 13B hybrid likes it at 1100-1200 rpm. I'm using a Rb 2 piece manifold with a Dellorto.


Thanks, Ed

Jeff20B

iTrader: (13)

Mine is a 4 port R5 13B with a '77 Hitachi carb.

peejay

Depends on your carb and ignition and your exhaust system.

My streetport idled all day long at 600-800rpm.

My P-port *would* idle at 600 but I can't get a carb to meter fuel properly at RPM that low. With EFI it'd be no problem. With an open exhaust, it'd probably be no problem too, since the reason the carb isn't metering fuel very well is because there's pretty much no vacuum down there!

What ignition timing are you running?

EL5Letra

damn mine is from 1200-1500 lol..

OneRotor

iTrader: (3)

mine is between 1700 and 2k, but i found out last night that it's a dream above 8k

rxtasy3

iTrader: (2)

mine idles around 1k. but depending on the port size/design and amount of overlap will depend on what kinda idle u'll have.

dj55b

iTrader: (2)

whats a 12 stock suppose to idle at? isn't it around 950rpm? how can you guys go lower than that ?

rxtasy3

iTrader: (2)

any repair manual will give idle speeds for manual and auto trannys. stock idle for manual tranny is probably around 750.

dj55b

iTrader: (2)

ouch i still have to adjustmy carb even further ... mine dies off anything below ~ 1k. I need to check for vacumm leaks. Does not having any exhaust back pressure cause high idle?

Jeff20B

iTrader: (13)

All I know is exhaust backpressure = the devil.

dj55b

iTrader: (2)

haha .... alright then ... maybe i'll just keep my exhaust system as is ... just with the headers and no mufffler no cat no pipes no nothing

Jeff20B

iTrader: (13)

You want the most free-flowing exhaust system you can stand noise wise/legal. I'm not sure where all this "back pressure is good" stuff keeps coming from, but rotaries certainly don't like it.

DriveFast7

iTrader: (1)

All of my streetports have dellorto carbs, and idle @ 1000-1100 comfortably. Below that it'll stumble. Dad is also what both engine builders said would be the idle too.

13BTOY

iTrader: (1)

I plan to run 26L and 16T on this 4port. Do you guys think this is too much? Any suggestions on what it should be on a streetported 13B 4 port with a Dellorto?


Thanks, Ed

DriveFast7

iTrader: (1)

don't need that much timing ed. most guy do stock + 5*. Put it on the dyno to see how little more hp you get when increasing timing. I bumped my bridge from 27.5 to 30 and saw like 5hp. Not worth being in the danger zone for 5hp. Get a bad tank of gas or forget to reduce timing when hot out and blammo. Of course my bridge uses ceramics and they like more timing. Brad.