I have a friend with a Werber 45 and manifold on his 12a. I was wondering if the 45 would make good power on my 85 SE stock port 13b? I have an MSD and soon to be header and full 2.5.

Also, With the manifold setup: Would I be better off getting Mazdatrix's upper manifold or getting an adapter for the Weber intake to my 6port engine? I am not running my 6port sleeves or actuators. I was thinking the adapter plate blocked off the 5th&6th ports, if this is the case I will definatly go with Mazdatrix's upper manifold for $120.

What ya think?

 

A 48mm DCOE has more power potential than a 45. But the 45 "will work."

Buy the upper manifold. It's plug and play. Use 5th and 6th port sleeves. More low end torque!

 

My engine is a stock port. Mazdatrix's "kit" for a SE engine uses a 45DCOE. I just wanted to make sure it will not be a downgrade in power. Would the 48 be an upgrade to the 45 on a stockported engine? I'm looking for about 160-180 hp with the Weber, Full exhaust, MSD, efan, etc.

Thanks

 

I had a stock 13B 4 port (NA) getting 140HP to the rollers and it couldn't rev above 5500. This with a 45DCOE and 40mm chokes. You do not need a 48. If worried go look at the HP racing beat are getting with a mikuni 44 on a ported 6-port.

Bill

P.S. These were Proper HP not dynojet, so add 15% if you are a dynojet type.

 

bill are you sure that motor was tuned properly? No exhaust restriction .. ... etc.. etc...

My REPU has a dellorto 48 with 41mm chokes and that mother revvs to 8000rpms+ NO PROBLEM.

 

Couln't rev above 5.5k??? Not because of fuel starvation I hope

I had a feeling it would be enough. I couldn't see Mazdatrix selling a 45 kit for the SE and it not running good. I plan to use the Mazdatrix upper and my stock lower.

I have read that a good Fuel psi regulator would work with my SE fuel pump. It will be wasting alot of fuel to the return, but will it work?

Anyone know what jets and choke I should start tuning with for a stock port 84 13b?

Anything else I should know about this swap?

Thanks guys!!

 

Just to reiterate my original reply:

"A 48mm DCOE has more power potential than a 45. But the 45 "will work.""

i'd just put a holley 110gph or carter fuel pump in there. + holly 1-4psi fuel regulator.

chances are the stock fuel pump has a lot of mileage on it anyways.

ask mazdatrix what jetting they reccomend.

 

Yep, do it right the first time, Don't spend your money on something that just works when you have the potential for more power with the same motor and a minimal amount of more money.

 

I am getting the 45 for a real good deal. I don't plan to port this engine. The SE efi is crap and I want some old fashioned reliability in my life. My car will be taking new form in a few years so this setup is simple and temporary. I agree the 48 does have more power potential. Honestly, the stock power is nice so its worth it to me just to get the thing running smooth again.

Thanks for the help. I will contact mazdatrix and repost for anyone going with a 45 on a 6port.

 

It was, just the muppet who built it used a T2 lower and the intake was way too long. I have since corrected that. Now your 48 has 41mm chokes, which is an increase in flow area over a 45 with 40mm chokes of 5%. You can gain 5% more flow on a weber simply by modifying the butterflies and spindle a little. An unmodified 45DCOE will flow enough to get you to over 200HP. I put that as more than 'will work' an into 'will work very well'. In fact if you look at the results that racing beat got with a 44PHH vs a 50DCOE TB. If you generate a torque curve you will notice that they are identical, but offset by 500RPM due to different intake lengths.

So my conclusion is that, unless you are really after max top end, to the point where you are willing to give up 15HP at 5500RPM to get 15 more above 8000 I would stick with a 45. For a street car I would suggest that mid range is well worth keeping and will make for a faster car.

However free choice is a joyous thing.

P.S. TWM have stopped posting the article. If anyone wants to see it please PM me.