epion2985

heh, I am new to cars so I'd like to ask a few questions that might raise the desire in you to spear me but, heh, here it goes:



1. I have been reading up alot on here and learning alot of information. I am not to familiar with certain terms. So first I guess I wanted to ask what does "rebuild" mean? just remake a component (turbo, engine..)



2. what does 13b, 30b, etc. mean?



3.there is alot of talk about porting. And i have noticed there are quite a few erm... sizes you can go with, like street port, etc. What are all of them in order form smallest to largest?



4. What is bridging?



ps: I guess this relates directly to Q 2 and 3 but if anyone is willing to help out a new admirer and hopefully futur owner of an fd, do you think you can write or link to a complete guide to what can be and is done today to the ports, porting, bridging, mixing the two. Pretty much all things that are done to ports.







Thanks everyone

epion2985

ok I am an idiot, I see the sticky now



although it doesnt cover bridging so that still stands.

1Revvin7

When an engine is rebuilt, it means they replaced all the parts that were broken or out of spec usually. It can range from just new seals to all new housings/rotors ect ect..



13b is an engine code; 2 rotor 1.3 motor found in the 2nd gens

20b is the cosmo 3 rotor 2.0l motor

12a is the 1.1l 2 rotor motor found in the 1st gens

13b re is the cosmo 2 rotor motor

13b rew is the 2 rotor 3rd gen motor



porting varies a lot, size isn't as much important as how well the port flows..



Bridge port is making another smaller port in the shape of a ridge on the intake ports, thats creats a thin bridge of metal inbetween itself and the main port.



Here is a pic of a bridge port..

epion2985

thanks!!



I have also read all the links in the sticky and that helped too but I have two more things to clear up.



the sticky used different terms, like moster port and mild port, but here people talk about streets port etc. And they sticky links did not mention them. So is it just a different name for one of those ports?



another thing I am getting a feeling there are different names for porting intake and exaust ports. And the stiky have not mentioned anything about the exast ports.

rx7machine

Well, the difference in the names of each porting basically the different levels of porting. You have mild streetport, the lowest available. Then streetport. Heavy streetport. Half bridgeport, bridgeport, heavy bridgeport(highest available) It's not a set system or anything.. I don't think, but it's just more porting.

epion2985

thanks, btw what does "seal float > 8500rpm" mean in this context?

epion2985

also can anyone clarify what this person is talking about, I am so lost ^^

rx7machine

The PFC(made my Apexi) is a ECU(Electronic Computer Unit) and the commander is what's used with the PFC for easy control.

rotaspec

Seal float is a phenomenon caused by the mass of the seal being slung out at high rpms, rebounding off the housing surface and compressing its spring again. The result is chatter marks on the housing and short spring life.

The solution for high rpm engines is light seals (usually carbon based), but these don't live long in forced induction engines, and that's the reason for the question the original poster gave about ceramic seals. These offer light weight and high strength but cost about ten times the cost of steel seals.



Gary

epion2985

thanks.



do you think ceramic seals are worth the price?