awesome awesome work! im really enjoying and appreciating your videos! keep up the splendid work on restoring your classic cosmo!
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Originally Posted by rotarycrazy
(Post 10318973)
how big of an air compressor do you have?
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hmm I have a 60 gallon tank thats rated at like 10.2 cfm at 90. I might need to invest in a sand blaster then. Since i need to blast my RX2 that way I can just take my sweet old time with it.
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Just watched all the videos and man i learned alot from them. When do you think you're going to put the engine together (if you haven't already)?
and which cosmos came with a 20b? |
Originally Posted by ssonsk
(Post 10324286)
Just watched all the videos and man i learned alot from them. When do you think you're going to put the engine together (if you haven't already)?
and which cosmos came with a 20b? |
Originally Posted by SirCygnus
(Post 10325525)
the jc cosmo.
Doesn't mazda racing still sell 20b engine components and rotors? |
Awesome work Aaron. If only I had the patience for body work like you do...
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Originally Posted by ssonsk
(Post 10325619)
oh i see
Doesn't mazda racing still sell 20b engine components and rotors? |
some more inspiration for body work http://japanesenostalgiccar.com/foru...pic.php?t=4426
in case you ever need it that is... |
Originally Posted by rotarycrazy
(Post 10320452)
hmm I have a 60 gallon tank thats rated at like 10.2 cfm at 90. I might need to invest in a sand blaster then. Since i need to blast my RX2 that way I can just take my sweet old time with it.
Seriously though, once you have a blaster, you'll wonder how you ever made do without it. Instead of spending 20 minutes wire-wheeling a part, it takes 1 minute of blasting.
Originally Posted by ssonsk
(Post 10324286)
Just watched all the videos and man i learned alot from them. When do you think you're going to put the engine together (if you haven't already)?
and which cosmos came with a 20b? The Mazda Eunos/JC Cosmo, sold in the early 90s Japan-only was equipped with the 20B
Originally Posted by ssonsk
(Post 10325619)
oh i see
Doesn't mazda racing still sell 20b engine components and rotors?
Originally Posted by AGreen
(Post 10326177)
Awesome work Aaron. If only I had the patience for body work like you do...
Originally Posted by boyee
(Post 10326769)
some more inspiration for body work http://japanesenostalgiccar.com/foru...pic.php?t=4426
in case you ever need it that is... |
Arron loving the Cosmo restomod and reading trough tina's resto you do awsome work and I will be observing the progress. Looks like a good base for what you want should come out great.
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oh i see, one mroe question
are rebuilding rotary engines as easy as they look? |
It's pretty easy if you have some mechanical experience and skill. I'll be posting the video of the rebuild within 30 days I think, so you'll find out soon. :D
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Great work and good info . I been watching your videos .
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the best media to use to remove paint is baking soda itt does not leave a profile on the metal
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Originally Posted by kevk
(Post 10329391)
the best media to use to remove paint is baking soda itt does not leave a profile on the metal
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Aaron, when you are done patching all the holes have you gave it any thought what rust proofing you will be applying?
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Baking soda (actually, remember that the industrial version has far larger grains) is also nice because it has a natural anti-corrosion effect. Soda blasted parts can generally hang out in bare metal for a few months without worrying about rust.
I'll be applying a zinc-rich weld-through primer on panels where the backside will be hidden after they are welded in. Then after all the work is done, there are several products with long nozzles designed for rust coating hidden spaces like frame rails and rocker panels. On surfaces that have both sides exposed, I'll use POR-15. The interior floor, since it rotted from the inside out, will get a full coating of POR-15. The underside is for the most part already well undercoated. I'm just trying to decide whether to give the engine bay the whole POR-15 treatment or to just give it a shot of some high quality black paint (POR-15 "Hardnose" black, or rocker guard). |
Originally Posted by Aaron Cake
(Post 10328573)
It's pretty easy if you have some mechanical experience and skill. I'll be posting the video of the rebuild within 30 days I think, so you'll find out soon. :D
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Yes, the porting will be shown. But as I mentioned, it isn't the typical porting job. It is very conservative, only bringing the exhaust ports just shy of stock 2nd gen timings and only moving the primary ports down a little to boost midrange. The secondary and aux ports aren't touched at all.
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very interesting I just wanted to get down here and subscribe .. ==I love this stuff ..:icon_tup: waiting for the port job.. :)
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Part 7: My 76 Mazda RX-5 Cosmo Restoration - Intake and Exhaust Porting
Has it been nearly a month since my last episode? Wow, time does indeed fly. I've been quite busy preparing to build the engine. So in part 7, I cover the intake and exhaust porting. The engine is being built with GSL-SE 6 port plates and the Cosmo rotor housings as the basis for a 6 port turbo setup. This port job is fairly conservative, only opening up the primary ports a little and bringing the exhaust ports close to 2nd gen RX-7 specs. The goal is to maintain fuel economy, low and midrange torque, and idle quality. This episode covers everything involved in porting including: marking out the new ports, grinding the port shape, smoothing the bowls, smoothing port to runner transitions, smoothing the runners, grinding and blending the exhaust ports.
http://www.youtube.com/watch?v=y1Gy5sVMK3o |
Those are very nice ports :D
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When you port aaron do you only use stones/sandpaper or do you use burr bits/stones/sandpaper?
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I use the grinding stones on the irons to get the port shape and runner transitions all worked out. Then I just use the sanding rolls to polish out any roughness left over from the stones and to adjust all the ports and runners so they match, if necessary.
The housings are a little more complicated because they are a mixture of a steel sleeve and aluminum casting. Truthfully, I dislike porting rotor housings for this reason. Generally I start with a grinding stone to quickly bring down the chrome/steel to as close to the final port shape as I can get it, then switch to a rotary file to eat away the aluminum. It usually takes several bit swaps between a grinding stone and a rotary file as the aluminum has to be ground away, then the steel/chrome again, then the aluminum, then the steel/chrome, etc. Then when the port shape is finalized and the runner transition is done, I follow up with the sanding roll to smooth everything out and make any final adjustments to both ports. |
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