Re: Need Engine Identification Help Badly!!

booya · Post by **booya** » January 10th, 2007, 8:00 pm

Hey guys

I'm in the middle of prepping what I thought was a Mazda BP for my swap. A few things I have noticed make me wonder lately exactly what engine I have, wondering if anyone can help me identify it.
- The front main seal I bought for a 90-95 Mazda BP was too large, I had to go to mazda and have them match one up
- The valve cover gasket I bought was a FelPro for a 1.8, doesn't fit. I went to a dealer for one, its the same as the Felpro.....The last cover bolt on the distributor side of the gasket isn't shaped right...
- The only markings I can find on the engine are on the block: B6S7, is this a DOHC miata motor???
- The valve cover itself looks exactly like a Mazda BP, I had a 91 escort motor for parts and they are almost identical.
- The water pump I put on was for a Mazda BP, it fit fine.

Can anyone give me any suggestions?

Thanks

facko · Post by **facko** » January 10th, 2007, 8:45 pm

im not 100% on this but if everything was to large and the engine stamp has b6 on it...it might be a 1.6...but like i said im not sure bout that. cuz i kno some stuff off of bp's will work on b6's but anything that runs the length of the block wont match up cuz the bp's are longer...might want to wait for someone to clarify all this but thats my two cents

TREVO123 · Post by **TREVO123** » January 10th, 2007, 9:04 pm

B6S7 is a Dohc motor and its a 1.6 and pretty sure it a miata

facko · Post by **facko** » January 10th, 2007, 10:05 pm

nice i was right

reading the forums does pay off

booya · Post by **booya** » January 10th, 2007, 10:22 pm

Thanks for the replies, still a little confused though. The 5 spd protege transmission bolts right up to this motor. Also, the valve cover looks exactly like a 1.8 cover, did the 1.6 dohc miata look the same?

Thanks again

facko · Post by **facko** » January 10th, 2007, 10:26 pm

im pretty sure that protoge tranny bolts up because ppl w/ turbo'd b6's/b6t's use that tranny as an upgrade but there are other modifications that go along with that. have u tried seeing if the valve covers are the same size? or if they bolt up the same? cuz i think they both have the same basic shape

booya · Post by **booya** » January 10th, 2007, 10:33 pm

The only valve cover I have to compare with is the Escort GT one, slightly different shape but relatively the same. The gasket issue is what has me really confused. All the pictures I find for the 1.6 or 1.8 DOHC all have the same shape for the corner bolt. The gasket I need has the same shape for the left/right corner bolts on the distributor side. The only one's I can find have different left/right.

facko · Post by **facko** » January 10th, 2007, 10:41 pm

hm, im guessing from the gasket being to big and that stamp on the block that its a 1.6. it is hard to tell just based on that valve cover...from the pics ive seen the b6 covers are more rounded off than bp's...however...i the b6t valve cover is black and boxy like the bp...maybe u could try to measure the block and see if u cant find the measurments for each of the 2 somewhere online to compare?

Yoda · Post by **Yoda** » January 10th, 2007, 11:30 pm

If it is in a FWD configuration I could also be a B5 1.5L there were a lot dumped on the market by JDM importers that made the mistake of thinking they were FWD JDM B6 engines which there is not such thing. It and the B6 share the same block. In eastern Canada some of these engine have been know to show up in regular scrap yards. There is nothing wrong with them some of them put out the same power at the BP just that no one wants them because bigger is better mind set.

booya · Post by **booya** » January 11th, 2007, 10:12 pm

So there's no chance this is a BP then? Was the valve cover on the B5 the same? Is there any chance I can use this motor anyway? That's alot of wasted money....

Thanks for the ifno

booya · Post by **booya** » January 11th, 2007, 10:22 pm

Ok, found something else interesting. In the first link, look at the closeup picture of the valve cover gasket, distributor side, the 2 end bolts are different, one points outwards, this is the wrong one for my engine.
http://cgi.ebay.ca/90-98-1-8L-MAZDA-MXS ... dZViewItem

In the second link, the end bolts on the gasket are both the same, curved inward, this IS the one I need.

http://cgi.ebay.ca/MAZDA-MIATA-MX5-PROT ... dZViewItem

So, is my motor actually a BP? There has to be some definitive way to tell...Please help

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jaydog5678 · Post by **jaydog5678** » January 12th, 2007, 8:38 am

Just like v-6 engines, there is a marking on the block that will tell you what you have. The b6 and BP are identical looking on the outside but are not exactly the same for obvious reasons. If you look below the distributor, looking at where the cyl. head and block meet, there is a protrusion on the block with a marking on it. It will either say BP or B6, followed by several numbers.

Edit. I saw in the first post you had a B6 block. 1.6

booya · Post by **booya** » January 12th, 2007, 12:11 pm

Thanks for all the help guys. I finally identified it. THe markings under the distributor are B551-1. Apparently its a 1.5. Useless to me. The JDM importer I bought it from won't take it back but will swing me a deal on a real BP. Looking to sell the 1.5 if anybody is interested. Let me know.

THanks again

atlantamx3 · Post by **atlantamx3** » January 12th, 2007, 12:40 pm

FYI- the B5 is what came in the MX-3 in Japan if I remember correctly.

Almost as much power at the BP from what Vaughn has said in the past.

Yoda · Post by **Yoda** » January 15th, 2007, 11:02 pm

atlantamx3 wrote:FYI- the B5 is what came in the MX-3 in Japan if I remember correctly.

Almost as much power at the BP from what Vaughn has said in the past.

The factory specs on '97-'98 B5-ZE were advertized at 120hp in the AZ-3/ Presso (MX-3) When the B5 club was still around on there dyno days members were pulling the same or slighty higher numbers than the BP so they are nothing to snub your nose at. As strange as it may seem even the older B5-DE all seamed to be within 5-6 hp of the newer -ZE. If I still has a car to swap this engine into it would be my first choice over a BP.