Comparison between 13B REW, 13B- RE Cosmo, and 20B UIM

[Herblenny]

Here are my UIM from 13B-REW, 13B-RE Cosmo, and 20B Cosmo.

Enjoy!!

13B REW and 13B- RE top view
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison1.jpg

13B REW and 13B-RE Bottom side (REW is customized)
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison10.jpg

Comparison in length.. using the RB swaybrace as a straight edge..
Bottom
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison11.jpg
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison12.jpg

[Herblenny]

Top
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison2.jpg
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison3.jpg

13B-REW, 13B-RE, and 20B
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison5.jpg
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison6.jpg

[Herblenny]

13B-RE and 20B comparison.. They are the same in length..
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison7.jpg
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison8.jpg
http://i37.photobucket.com/albums/e79/herblenny/UIMcomparison9.jpg

[Herblenny]

http://i37.photobucket.com/albums/e79/herblenny/RE2REW4.jpg
http://i37.photobucket.com/albums/e79/herblenny/RE2REW5.jpg

Modified 13B-REW
http://i37.photobucket.com/albums/e79/herblenny/RE2REW14.jpg

normal 13B-RE
http://i37.photobucket.com/albums/e79/herblenny/RE2REW15.jpg

[Herblenny]

http://i37.photobucket.com/albums/e79/herblenny/RE2REW13.jpg

Here are the TBs

20B TB vs 13B-REW

http://i37.photobucket.com/albums/e79/herblenny/RE2REW1.jpg
http://i37.photobucket.com/albums/e79/herblenny/RE2REW3.jpg
http://i37.photobucket.com/albums/e79/herblenny/RE2REW2.jpg

[cabaynes]

Nice pics Phil, although a bit dark ;)

You said you plan on using the RE manifold on your REW motor?

[McVicker]

are there any proven advantages to the Cosmo RE intake manifold?

[TRISPEEDFD3S]

Hmore power in the high end, but you lose some torque in the lows I believe.

[IR Performance]

I believe it is the opposite. The 20b and 13bre were both found in the larger luxury car the cosmo. The motor was more tuned for torque in that application. It had larger intake ports and runners, but smaller exhaust ports. They do flow better than the 13brew manifolds however.

[Chadwick]

Interesting, I’ve never really thought about it before, but your two responses got me thinking. I’ve always “heard” the RE intake manifold increased low end torque, but that does go against conventional wisdom when compared to the REW intake. Generally increasing the intake runner length increases low end torque. Unfortunately they are not a direct comparison as the RE intake does have larger primary runners and the parabolic chamber. I guess there is no way of knowing for sure without testing.

I nominate Phil as the guinea pig to test it out :D



Dan

[IR Performance]

I don't think the runners are on the RE are longer. The manifold does have more capacity however.

[charlies7]

I have a set of RE manifolds waiting to be tested Dan..This summer I will dyno using both and let everyone know. Too bad I have to run two different fuel systems..At least the secondary rail :(

Who knows though maybe Phil will beat me to the task. However I am expecting more top-end power and a better power curve..turbo undecided :(

Interesting, I’ve never really thought about it before, but your two responses got me thinking. I’ve always “heard” the RE intake manifold increased low end torque, but that does go against conventional wisdom when compared to the REW intake. Generally increasing the intake runner length increases low end torque. Unfortunately they are not a direct comparison as the RE intake does have larger primary runners and the parabolic chamber. I guess there is no way of knowing for sure without testing.

I nominate Phil as the guinea pig to test it out :D



Dan

[cewrx7r1]

I do not believe runner lenght has much affect on turbo cars as they do not have to rely on intake dynamics to make power. They are forced fed.

[McVicker]

I'd be interested to see someone who has access to a dyno, test one manifold, uninstall it and put the other on and test again in the same day to get an accurate comparison.

-Dan

[Herblenny]

You can't really run cosmo lim on the REW short block without port matching. Ports on the REWs are about 20% smaller.. I'll post some pics later..

So, that being said.. in order to take advantage of RE LIM you need to port match the LIM to REW.

[McVicker]

so test the REW LIM/UIM and then swap it out for the RE LIM/UIM ;)

[Bryan@BNR]

I would nominate phil as well! All these years we have been putting these cars together and phil never gets his car tuned! Come on phil, lets make 400!

Phil, if you want me to make it work on a FD lower manifold I can weld up holes that don't line up and drill and tap new holes, port match... Piece of cake.

[Herblenny]

LOL!

Bryan, I'm hoping to make close to 400 or break 400 with this set up... I'll let you know if I need your help:)

[Bryan@BNR]

Cosmo intake manifolds are nice and the plenums are larger than the REW. The REW runners are longer. Usually, larger plenums are better for top end and longer runners are better for TQ. Being forced induction with a standard side port or street port, it won't make a hill of beans difference between the 2 b/c power tends to fall off after 7600. If you were half BP or PP then you would need the added plenum area for increased RPM capabilities.

Bryan@BNR

[circuit theory]

I am totally lost with what or how we are supposed to measure using the sway bar brace??? :lol:

AND THEN YOU PULLED OUT A FREAKING MEASURING TAPE AFTER THAT???!!!!

:lol:

[scotty305]

Nice photos. The bend radius looks better on the RE manifold, and the runners on that RE manifold have a much larger diameter than the REW manifold. Is this because it has been modified, or were the runners larger to begin with?


Does anyone know which was designed first, the RE or the REW manifold?

-s-

[Barry Bordes]

The runners on the RE are taller than the REW's but the main difference is the pocket just before the port.

The REW is like a 90º fitting vs. the RE’s 45º angle.

If you look closely at the floor of of the runners you may be able to make it out.
Barry

[felix_is_alive]

so basically your`e saying that the RE has better ports than the REW ?

[Herblenny]

The runners on the RE are taller than the REW's but the main difference is the pocket just before the port.

The REW is like a 90º fitting vs. the RE’s 45º angle.
http://www.rotarycarclub.com/attachment.php?attachmentid=336&d=1204767453
If you look closely at the floor of of the runners you may be able to make it out.
Barry

Thanks for the Pic Barry!

PHIL