By errol (205.188.192.24) on Sunday, January 14, 2001 - 06:57 am:

Does anyone know what the Serial numbers are that were offered on the 80 cvcc 1300? (for the 4.93 ratio) I have found a few at local yards but don't want to get a highway gear. (i just can't understand why they didn't 'stamp' the numbers in the bellhousing) another thing...back on some threads there was talk of grinding the flywheel on a accord engine to get it to fit in the earlyer (smaller) bellhousings? or maybe it was just the flywheel was bigger for the 81 EK engine.....HELP

By Charles (137.219.16.107) on Sunday, January 14, 2001 - 07:32 pm:

If they are out of the cars just spin the input shaft and work out how many turns on the diff to get a ratio. Go in armed with the final ratios of the 4.933:1 gearbox. ie gear ratio by diff ratio. Do it for each gear.

By John S. (207.160.161.162) on Wednesday, January 17, 2001 - 12:19 pm:

All USA 80-81 1300 5-speeds were the close-ratio gearsets...the 1500's are not...Wagons are different still.

By errol (152.163.195.207) on Thursday, January 18, 2001 - 01:55 am:

i found a four door that is stacked on its side and cant get to the door or hood to see what year it is. Was just wondering if the 4 dr had the same 'good' tranny. It's in the same yard as the wagon.

By errol (152.163.195.207) on Thursday, January 18, 2001 - 01:58 am:

oops.... if anyone out there has the 1300 tranny could you look and give that info pleeaase! The number that is on that goofy gold tape on the top of the tranny

By errol (152.163.195.207) on Thursday, January 18, 2001 - 02:01 am:

Hey charles; get back to me about boring out a 1500 or a 1300 max limits please. I got a hold of a couple of 1300's and i read about your car...sounds good!

By Charles (137.219.16.107) on Thursday, January 18, 2001 - 02:31 pm:

Hey Errol,

For turbo charging we do not go past 74mm in the 1300/1200 blocks. Also the aftermarket head gaskets are often exactly 74mm in diameter so they fit perfectly. If you want to stick to honda parts you can whack in a fresh set of Honda 15oo pistons into the 1200/1300 once it's bored to 74mm. As for the 1500 we dont spend a lot of time with them. I'd say an extra 2mm would be no hassle at all, prob go a bit more.

Charles

By Charles R. (207.104.157.149) on Thursday, January 18, 2001 - 11:33 pm:

Whoa!
74mm AND turbo'd? When I found out how thin my liner walls were, I gave up on ever turboing the thing. Am I hearing that I could boost it reasonably safely?
Please, let me know a little more info.

By errol (152.163.205.79) on Friday, January 19, 2001 - 01:41 am:

speaking about pistons (i don't want to get off the subject too far....but) I was looking through all my 'stuff' and noticed that the 83 civic S pistons were a true flat-top unlike the earlier ED 1500's. that had a dish. (??) COOL... but these would be a normaly aspirated engine. How do you know i have a turbo motor? (that's going to be a 1751 overbore with the 'fun stuff' swapped)That is if i can ever save enough to order the stuff from RACECRAFT. Did you use the crank rods and pistons or just the pistons from the 1500?

By John S. (207.160.161.165) on Friday, January 19, 2001 - 11:17 am:

Early 1975 CVCC pistons were also flat top . I'd like to know what the overall comp ratio using either the early '75CVCC pistons or the '82-83 1500CVCC pistons would yield with a Canadian EL non CVCC head. Anyone know this?

By errol (152.163.195.194) on Saturday, January 20, 2001 - 05:46 am:

Every 'early 1500' engine i've seen has had a dish of some degree. It's just when i rebuilt a 83 motor they asked me to be year specific. (??)To which they gave me the flat tops, unllike what came out. And i have 2 ed1 motors and both of them are dished. But speaking about comp ratios... I did try the head off of that 38 civic S on a 1600 EF motor and the combustion chambers were noticeably smaller,(Depth wise) and the valves did 'touch' the piston dishes. I guess i should have started another thread for this stuff, Sorry. (DAMN...DOES ANYONE KNOW HOW TO STOP THESE F@#^*()NG POP UPS!!! THEY'RE DRIVING ME NUTS) I guess yet another thread!

By Charles (137.219.16.107) on Monday, January 22, 2001 - 04:08 pm:

Peter, the guy with the white turbo civic on my web page has 4 flat top genuine 74mm pistons still in boxes from a 1500. He got them before he got forged pistons (just to be on the safe side). Anyway he runs a 1300 crank and rods, 74 mm forged pistons and 15psi of boost with a garret GT25 ball bearing turbo. The thing is mind bogglingly fast and puts out over 200hp. ZTo date even with extensive DYno time and track time (as well as road use) there has been no problems with the liners. But make sure you use an EB2 or later block, an EB1 puts you 2mm behind the 8ball to start with.

Depending on the combustion chamber size it may be sensible to go to dished pistons for turbocharging to reduce compression ratio.

Charles

By Anonymous (24.70.227.64) on Monday, January 22, 2001 - 06:23 pm:

74.5 mm, but these are flat tops:
http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?ViewItem&item=545202029

By Todd (63.52.20.215) on Tuesday, January 23, 2001 - 07:26 am:

Back to the original thread, my 80 5-speed with the 4.933 differential has the following serial number. GJ-8608901. This number or any smaller will be the tranny in question. I would imagine in Australia this number would start with GN. (US had the EJ 1300 and Australia had the EN 1300)

By errol (152.163.207.204) on Wednesday, January 24, 2001 - 05:59 am:

Pardon my ignorance Todd, but i should look for a tranny that starts with a GJxxxxx as long as the numbers are numericaly smaller? Thank you for looking though.

By Todd (63.52.4.31) on Wednesday, January 24, 2001 - 10:58 am:

As far as I know that's correct.

By Andrew Fatseas (61.12.0.53) on Saturday, January 27, 2001 - 07:00 pm:

Charles,

How on earth does this guy with the turbo and 74mm pistons stop the head gasket from blowing all the time, given the propensity of these cars to blow them with *no* boost?

Andrew

By John S. (216.89.156.82) on Saturday, January 27, 2001 - 08:05 pm:

On the '80 close-ratio 5-sp...USA no. are GJ8600001~on. '81 USA is GJ8700001~on. Either is the 5-sp gear spread with a 4:93 final drive.
For you autocrosses though the '74-'77 4-sp is tighter still...just not too great on the road for cruising.

By errol (152.163.205.20) on Saturday, February 03, 2001 - 07:21 am:

Hey john; is this 'wanted' tranny only in the 1300 cars? or can it be in the 1500's also. I'm building a engine for a guy for his 5 of 80 civic that he says 'really goes' (but he's got a 'wine' in reverse, He might need another tranny Hey, this civic has solid rotors??? I thought the 80's- up had vented ones?

By errol (152.163.205.20) on Saturday, February 03, 2001 - 07:27 am:

Oh by the way, his tranny started with GMxxxxx ???

By John S. (207.160.161.179) on Saturday, February 03, 2001 - 01:18 pm:

It is in the USA 1300's only. The GM is 1500 designation...different gearing.

By John S. (207.160.161.179) on Saturday, February 03, 2001 - 01:20 pm:

Oh. the vented rotors started in '82, or '83.

By errol (152.163.204.177) on Saturday, February 03, 2001 - 10:04 pm:

thanks!

By errol (152.163.204.176) on Thursday, March 08, 2001 - 07:11 am:

Damn.. This kid spent all of 1/2 hour on the phone and found a GJ tranny for a 100.00 and they pulled it!!!! Man am i jealous! I'm going 'hunting' for one or two today!

BTW; he gave me the old GM tranny as payment. I'll have to open it up to find what makes it whine in reverse though

Any suggestions? no shavings are visable on draining. but the clutch let go when he missed 5th and hit 3rd instead (sloppy shifter bushings)

By errol (152.163.204.177) on Saturday, March 10, 2001 - 04:59 am:

I FOUND ONE HE HE.... It's just that it's still in a car and it runs. So..The yard said 400.00 for it. I'll get it and swap trannys, sell it.