rx8frank

This thread replace the 20b ring a bell !!!! thread.

A friend of mine bought this 20B last summer and planned to do a complete rebuilt of the engine. In the past he did a lot of 13B rebuilt and wanted a other challenge. The goal is to Street port the engine and put on a turbo. The number of HP is not set yet but the range would be between 500 to 600 bhp.

With that said here's the pictures....enjoy







the old twin sequential turbo





We removed everything around the engine and the oil pan

rx8frank

Here is the oil pan



We knew that the engine had a blown rotor... here a picture of the broken apex seal


Time to remove the bolts



Here is the image of the rear side rotor housing



The rotor and rear rotor housing

rx8frank

Here a closed shot of the broken apex seal





Close view of the rotor





Rear rotor housing





Middle side housing



Middle rotor

rx8frank

Here a view of the middle rotor with housing





My friend had to fabricate a puller for the removable part of the exentric shaft





Here it is





All the parts of the 20B (Rotors not in the pictures)

rx8frank

Here is some various test

Iron micrometer test



Oil seal wrapage test





Eshaft end play test



Rotor bearing test



Stationary gear bearing test



Front bearing test




Here it is for now; we are curently at cleaning all the parts and some quote pricing for the resurfacing of some of rotor housing and ordering all the seals needed for the rebuilt.... and by the way we have all the template for the porting but now it's the time we don't have....I'll post more pictures in a week or so.

Brettus

iTrader: (2)

cooool
vernier calipers to measure bearing surfaces - is that accurate enough ?

Greddyturbo1

Cool pictures, don't stop here show us all you can.. What are you going to put the 20B in...

Zephyr Words

Thanks for the pictures. It was a fun read. :D

09Factor

Thanks for the pics. I always like looking at rotaries that are being rebuilt.
have you though about gettin the rotors, housing, and side plates coated with Polydyn?

jeffe19007

Keep the photos coming! I for one, am lusting after this engine...

gh0st

must be nice to have peripheral ports. i love how you can just pop off the headers (slight exaggeration) to look at your seals. plus your odds are much, MUCH better that your broken apex seal wont do permanent damage to your housing. im jealouse...

rgonza

Nice Photos !!!!Remenber you can use the same rotor and housings from 89 to 95 turbo rx7.

Greddyturbo1

Rgonza, Is there any advantages to using these , other than easy to locate and price.

rotary crazy

the exhaust ports are bigger in the 13b, but he is porting them any way

rx8frank

i think he want to go with a cermet coating

rx8frank

Ya you're write 'cause we knew that the engine was damage but when we open it we were surprise to see that the broken seal didn't do much damage to the rotor housing as we taught it would.

rx8frank

Sorry for posting so late lots of party and now I'm sick as hell maybe the flu

An by the way thank you for your reply. I'll try to contact my friend if he has some new stuff to post.

Frank

rgonza

[QUOTE=Greddyturbo1]Rgonza, Is there any advantages to using these , other than easy to locate and price.[/QUOT

There're more easy to locate the 20b part's are more hard to find.

rx8frank

**** UPDATE *****

As for now the rotors are being sent to be modified to fit a 3mm apex seal and we sent the rotors housing for resurfacing with a cermet-b coating.

And now a couple of weeks to wait....patiently

Stay tune more photos to comming SOON.....

R.P.M.

iTrader: (1)

Nice Frank! Did you send the housings to JHB? Keep us posted!

crispeed

It's not so much the ports are bigger but the exhaust sleeves are where the major differences exist. The 20B rotor housing came with a very small exhaust sleeve insert that were mainly designed for noise reduction. The problem is that they cannot be ported to what is the norm of the 13B/two rotor housing. The cheapest but not the easiest method is to replace the 20B inserts with those from the 13B. The most expensive and easiest method is to purchase new 89-95 13B Turbo Rotor Housings.

rx8frank

**** UPDATE ****

It's been decided where this engine will go......









The FB RX-7 of my friend... he decided to remove his 13B turbo (300 hp) to put the 20B in .....talk about crazy hehehe this thing is gonna be a Road Monster

His car in the photo, it's the gold FB RX-7 on the right...

diabolical1

wow. please keep me (us) updated.

rotary crazy

very well said, more or less the same that I said but im a bit english challenge

rotary crazy

A friend has the sickest fb 3 rotor I have seeng Ill see if I can get some pics, for motivational purpose