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Index > Engine/Drivetrain > Thread: My new motor arrived, installed, and is running
Thread: My new motor arrived, installed, and is running
brad


Rotorhead
Posts: 1672
posted July 22, 2004 11:12 AM

My new motor arrived, installed, and is running

13b 4 port streetported, upgraded oiling system 85psi, upgraded water o-rings, old school rotor housings with only 40,000miles on them!!!!

Making good power.






Centerforce II



____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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EricHappyMeal


1st Gear
Posts: 39
posted July 22, 2004 11:34 AM

wow

that looks mighty fancy! you should let me have a ride in it :)
____________
Whats up with cranberries?

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brad


Rotorhead
Posts: 1672
posted July 23, 2004 12:15 PM

hi eric,

come on by for a ride in the Lawn Green REPU. I'm in southern california: redondo beach
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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klaus43


Rotorhead
Posts: 1259
posted July 26, 2004 10:34 AM

Nice!

Are those airhorns in your Dellorto an improvement over the older style? I should probably talk to you about Dellortos...

       
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brad


Rotorhead
Posts: 1672
posted July 26, 2004 01:27 PM
Edited By: brad on 26 Jul 2004 13:28

Yes Klaus

Those TWM Induction full radius bellmouth 4" (100mm) long stacks to put out some more torque. Instead of shifting @ 4500rpms for normal day to day driving I shift @ 4000rpms.

$90 both. European Motorworks in Hawthorne, CA or you can go directly thru TWMInduction.com

On the SCCA racing websites almost everyone says they're the best. Pipercross 2nd. Homemade 3rd.

I'm happy to talk Dellorto all day! What's the questions?

Brad
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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klaus43


Rotorhead
Posts: 1259
posted July 26, 2004 01:38 PM

As of right now...

...just about everything! Having purchased Jeff20B's setup, and awaiting a rebuild kit in the mail, am set to educate myself in-depth... What is the 'best' choice of inlet needle seat sizes for stock 13B 4-port? Of course, it might not matter, if I can't source the correct size...

       
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brad


Rotorhead
Posts: 1672
posted July 26, 2004 03:53 PM

3.00 needle and seat is best

But no one in USA or England has them new. Have to go through Spain or Italy to get them.

2nd best is 2.25. I have heard of people reaming them out to 3.00. To do that right, buy the jet reamer kit and large jet gauge set from CBPerformance.com

Feel free to start another thread for Dellorto jetting. I'd also need to know what if any porting and exhaust upgrades were done.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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Jeff20B


Moderator
Posts: 661
posted July 27, 2004 12:51 AM
Edited By: Jeff20B on 27 Jul 2004 00:56

Brad, let us know how your dellorto runs on that ported engine. It looks like it's got the correct 3B side plates and the correct rotor housings. Nice!

By the way, how did you like blocking the temp sensor hole in the top of the intermediate plate? Also, what size clutch did you get? It's hard to tell from the pic, but it looks like a 215mm. Stock REPU is 225mm with a funny offset rendering it unique (no other rotary in the US used this clutch). You can get away with 225mm '83-'92 stuff with that aftermarket flywheel I see in the pic.
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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brad


Rotorhead
Posts: 1672
posted July 27, 2004 09:53 AM

quote:
Brad, let us know how your dellorto runs on that ported engine. It looks like it's got the correct 3B side plates and the correct rotor housings. Nice!

By the way, how did you like blocking the temp sensor hole in the top of the intermediate plate? Also, what size clutch did you get? It's hard to tell from the pic, but it looks like a 215mm. Stock REPU is 225mm with a funny offset rendering it unique (no other rotary in the US used this clutch). You can get away with 225mm '83-'92 stuff with that aftermarket flywheel I see in the pic.


The dellorto runs the motor like a bat outta hell. Real nice setup. Went down from 41mm to 40mm on chokes so it'll have some low end torque. It was the right decision; not as peaky a powerband. Yes, 3b plates, intermediate plate has old school m logo.

That gosh darn water hole on the int. plate is a royal pain to block. It still leaks. My REPU came with a aluminum plate but it wasn't straight. I rubber malleted it flat as possible but it looks like I'll be making my own now. Used gasket sealer etc.. on there. Worst part is the driver side bolt for that plate rubs on my air filter so I can't go too much taller on it. 215mm clutch to match the RB aluminum flywheel that came with my REPU. Dave Lemon said I could use a 225mm clutch IF my flywheel had the 3 cutouts on it cause of the 225mm pressure plate design. Since he didn't have any hipo 215 or 225mm clutches in stock I just ordered the 215 Centerforce II and waited. No prob. Thanks for the feedback. I wanna dyno the motor before Xmas.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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Jeff20B


Moderator
Posts: 661
posted July 28, 2004 12:05 AM

That's weird that you can't use a 225mm setup on your flywheel. I thought all RB flywheels for '74-'92 NA could handle 215mm and 225mm clutches.
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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brad


Rotorhead
Posts: 1672
posted July 28, 2004 09:26 AM

The friction surface on the flywheel can handle another 10mm. But Dave pointed out the flywheel needed three recesses in it to accomodate the 225mm pressure plate design.

I remember those recesses from my RB 225 light steel flywheel and Centerforce aluminum 225mm flywheel.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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Jeff20B


Moderator
Posts: 661
posted July 28, 2004 12:12 PM

Are all of RB's aluminum flywheels like this? Perhaps that's why my friend got 215mm components for his aluminum flywheel.

Copy and paste.
http://www.geocities.com/cd23c01/gslseclutch.jpg

Wait a minute. I see all the required recesses in this aluminum flywheel. Now my mind is starting to wobble.

Ok, I'll confirm that the diameter of his clutch disk is truely 215mm some time next month when we pull the engine to get it ready for a VW installation. I'll then question his sanity for getting 215mm stuff instead of 225mm stuff. Hehe.

It's funny that I have a slightly used 215mm SS HD disk and another slightly used 225mm SS normal duty disk, yet the 225mm went on my 20B. I mated it to a '76 cosmo Ribcase tranny, so I needed the '74-'92 stuff rather than the 240mm turbo stuff. It's NA so I should be fine as long as I don't abuse it. I was told the larger diameter handles torque better, even though the 215mm was the 'HD' version (some sort of epoxy has gummed up all the marcels giveing a much faster engage/disengage characteristic). I'll save the 215mm for a souped up 12A or something.
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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