1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

weber 42dcoe on 13b

Old 04-16-17, 08:32 PM
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weber 42dcoe on 13b

recently aquired a weber 42 off a buddy to use on my 13b since my dellorto 48 is pretty screwed up. my question is what jet sizes should i use to make sure its not running lean or anything.
Old 04-16-17, 08:35 PM
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carb came off a turbo 13b.. im really just asking if i should upgrade or if i can just get away with jetting
Old 04-16-17, 09:15 PM
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You can get away with it but it won't be enough for a 13B. Not enough CFM for a non boosted 13B.
Old 04-16-17, 09:56 PM
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Originally Posted by t_g_farrell
You can get away with it but it won't be enough for a 13B. Not enough CFM for a non boosted 13B.
i am a fan of new things and since my dellorto is quite a fucked situation i may just buy a nice new weber, what would you recommend? 45 or 48?
Old 04-17-17, 07:42 AM
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Originally Posted by glitchinq
i am a fan of new things and since my dellorto is quite a fucked situation i may just buy a nice new weber, what would you recommend? 45 or 48?
Consensus on the weber for a rotary would be a 48 DCD. Getting the 48 DCOE would be
worse than the Dellorto. What kind of issues is the Dell giving you? Did you check this
site for jetting for the Dell on a 13B Gruntled.com - Dellorto - Jetting ?
Old 04-17-17, 11:49 AM
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Originally Posted by t_g_farrell
Consensus on the weber for a rotary would be a 48 DCD. Getting the 48 DCOE would be
worse than the Dellorto. What kind of issues is the Dell giving you? Did you check this
site for jetting for the Dell on a 13B Gruntled.com - Dellorto - Jetting ?
the dellorto was put together by someone not so knowledgeable with them. floats are out of wack and some other ****** is going on with it. i may get a rebuild kit and work on it as time passes but i most likely am going to end up with something new
Old 04-17-17, 11:51 AM
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plus im not trying to have to buy a new intake + carb. cant quite afford both at the same time since i have multiple projects lol.
Old 04-17-17, 12:38 PM
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Carbies take patience and time to get tuned right, its not like EFI in a modern car. You should try a nikki.
Old 04-17-17, 05:31 PM
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How is the Dellorto screwed up?

Unless it's been drilled or otherwise hacked up, it probably needs the correct jetting or new soft parts. Floats can be adjusted. I think tuning it will be cheaper than getting a whole other carb.

There's a tuning book at the bottom of the RX-7 Manuals page on foxed.ca if you are not familiar with them.

Originally Posted by t_g_farrell
Consensus on the weber for a rotary would be a 48 DCD.
Getting the 48 DCOE would be
worse than the Dellorto. What kind of issues is the Dell giving you? Did you check this
site for jetting for the Dell on a 13B Gruntled.com - Dellorto - Jetting ?
How is the 48 DCOE worse than the 48 DHLA?
I thought they're very similar with the biggest difference is the DHLA has a diaphragm accelerator pump, Weber has a metal plunger. And Dellorto jets have a finer range.

Where have you seen a 48 DCD? The Rotary Engineering kit is dual 36 DCD. Did you mean IDA?
Old 04-17-17, 08:20 PM
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Originally Posted by j_tso
How is the Dellorto screwed up?

Unless it's been drilled or otherwise hacked up, it probably needs the correct jetting or new soft parts. Floats can be adjusted. I think tuning it will be cheaper than getting a whole other carb.

There's a tuning book at the bottom of the RX-7 Manuals page on foxed.ca if you are not familiar with them.



How is the 48 DCOE worse than the 48 DHLA?
I thought they're very similar with the biggest difference is the DHLA has a diaphragm accelerator pump, Weber has a metal plunger. And Dellorto jets have a finer range.

Where have you seen a 48 DCD? The Rotary Engineering kit is dual 36 DCD. Did you mean IDA?
Yes, I meant IDA, sorry. The DCOE is harder to tune and less flexible plus RB did some magic to the Dell to make it work better.
Old 04-18-17, 03:58 PM
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Originally Posted by j_tso
How is the Dellorto screwed up?

Unless it's been drilled or otherwise hacked up, it probably needs the correct jetting or new soft parts. Floats can be adjusted. I think tuning it will be cheaper than getting a whole other carb.

There's a tuning book at the bottom of the RX-7 Manuals page on foxed.ca if you are not familiar with them.



How is the 48 DCOE worse than the 48 DHLA?
I thought they're very similar with the biggest difference is the DHLA has a diaphragm accelerator pump, Weber has a metal plunger. And Dellorto jets have a finer range.

Where have you seen a 48 DCD? The Rotary Engineering kit is dual 36 DCD. Did you mean IDA?
Some things are held together with jb weld, etc... I have a fair but if knowledge tuning these carbs and jetting.
I may use this for awhile hole I save for a ida.
Old 04-18-17, 09:00 PM
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Sounds like it's hacked up for sure. Carry on.


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