new to rotary need some help

wanklefactory · 11-21-2012, 07:26 PM

just picked up a 83 rx-7 with the 4barrel 12a ive been working on it for about a week now new gas cleaned the jets put a new float in it and i still cant get it to run rite it idles great at 750 rpm has no problems starting hot or cold but it hesitates bad tap the gas it wants to die out and after i get it warmed up and seems to be running ok i take it for a ride around the block runs fine tell i get about half way then i cant even make it up the hill to my house it bogs when you hit the gas dies sounds like its running on one rotor sometimes and i already comp checked it passed with flying colors so im stumped now any help will be much appreciated

GySgtFrank · 11-21-2012, 07:39 PM

Hesitation when hitting the gas is usually an accelerator pump problem. Typically an old leaky diaphragm. Get a quality rebuild kit and rebuild the Nikki. Good first place to start. You do know that compression testing a rotary is different than a piston engine? Who did the compression test?

wanklefactory · 11-21-2012, 07:54 PM

i think the pump is ok i get good squirts of gas when i hit the throttle and yes i know its different i got 3 even pulses of 90psi on each rotor

79rx7 · 11-28-2012, 09:02 PM

when you experince this problem can you pull the choke out a bit to see if this makes a diff. its either going to be terrible and kill the motor
or it will power up the hill either way you find out what going on
make sense?

11-21-2012, 07:26 PM	#1
wanklefactory The Newbie Join Date: Nov 2012 iTrader: (0) Posts: 5 Rep Power: 0	new to rotary need some help just picked up a 83 rx-7 with the 4barrel 12a ive been working on it for about a week now new gas cleaned the jets put a new float in it and i still cant get it to run rite it idles great at 750 rpm has no problems starting hot or cold but it hesitates bad tap the gas it wants to die out and after i get it warmed up and seems to be running ok i take it for a ride around the block runs fine tell i get about half way then i cant even make it up the hill to my house it bogs when you hit the gas dies sounds like its running on one rotor sometimes and i already comp checked it passed with flying colors so im stumped now any help will be much appreciated

11-21-2012, 07:39 PM	#2
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. iTrader: (0) Posts: 1,005 Rep Power: 15	Hesitation when hitting the gas is usually an accelerator pump problem. Typically an old leaky diaphragm. Get a quality rebuild kit and rebuild the Nikki. Good first place to start. You do know that compression testing a rotary is different than a piston engine? Who did the compression test? __________________ 1979 SA22C (parts of one anyway) http://rotarycarclub.com/rotary_foru...ad.php?t=15585 1975 MG Midget (building) http://rotarycarclub.com/rotary_foru...ad.php?t=18681 1988 N/A SE model FC, dead stock and less than 85k on the clock. This one actually runs, so I don't fuck with it.

11-28-2012, 09:02 PM	#4
79rx7 The Newbie Join Date: Oct 2012 iTrader: (0) Posts: 12 Rep Power: 0	when you experince this problem can you pull the choke out a bit to see if this makes a diff. its either going to be terrible and kill the motor or it will power up the hill either way you find out what going on make sense? __________________ Spokane,WA. Directly above the center of the earth

11-21-2012, 07:54 PM	#3
wanklefactory The Newbie Join Date: Nov 2012 iTrader: (0) Posts: 5 Rep Power: 0	i think the pump is ok i get good squirts of gas when i hit the throttle and yes i know its different i got 3 even pulses of 90psi on each rotor