Help

[dirttrackegt90t]

hello all i am doing a escort gt1.8 bp build i was told to use pistons out of a miata cuz there flat compared to a boul type thas in mine well i took my head off and wow i found plat pistons with cut outs for the valves what do i got if there is any body that can help me that knows what i got please let me know thay can also call 217-259-7664 thanks TONY . I CAN USE ALL THE HELP I CAN GET ..

[1992tracerlts]

you have stock bp pistons lol. the miata ones just have slightly higher compression ratio i believe.

[therieldeal]

99+ miatas only will have higher compression

[Turpro]

99+ miatas only will have higher compression

94-95 had the 8:8 comp like the escort/protege bp. 96-98 had true 9:1

[therieldeal]

a .2 change in CR is hardly worth a piston swap though... you can get that much by just shaving the head.

[mx-3_4evr]

Just go with the 2000 miata pistons. IIRC the compression ratio is 10:1

[dirttrackegt90t]

Motor

Thanks All But What I Want To Know Is I Have Been Told That My Stock Pistons Should Be Like A Boul On Top And Mine Is A Flat Top With Cut Outs For The Valves.. What Do I Have ???

[jumpncrash]

read the 2nd post in teh thread, you have normal BP pistons.

[Shades]

They're most likely slightly dished...

... and if you hold your keyboard to the piston we could tell you, but if you take a pictures so we can see you might get a better answer.

AND all BP pistons have cut outs for the valves, that's what makes it a non-interference motor... and if you shave your head more than .020" you run the risk of taking that away.

You need to give more info on what you are looking at, what you are trying to achieve... ie. a turbo motor or a N/A motor.

If your motor in your, let me take a wild guess, 1990 Escort GT has never been touch then you have stock 8.8:1 compression pistons.

[dirttrackegt90t]

read the 2nd post in teh thread, you have normal BP pistons.

thank you i just wanted to confirm thay were stock

[dirttrackegt90t]

They're most likely slightly dished...

... and if you hold your keyboard to the piston we could tell you, but if you take a pictures so we can see you might get a better answer.

AND all BP pistons have cut outs for the valves, that's what makes it a non-interference motor... and if you shave your head more than .020" you run the risk of taking that away.

You need to give more info on what you are looking at, what you are trying to achieve... ie. a turbo motor or a N/A motor.

If your motor in your, let me take a wild guess, 1990 Escort GT has never been touch then you have stock 8.8:1 compression pistons.

thank you this info help also and it is a 91 car but i got another motor from the junk yard to do the build i think is a 95-96 1.8 bp im gona have a head planed 15 thousands thanks for all the help. TONY .. ITS NON TURBO

[therieldeal]

http://www.liptonius.com/miata/mission/engines_files/MX5Engine.htm

that was the best writeup about the BP, lots of good pics....

then AOL hometown shut down so all thats left are thumbnail pics.

[dirttrackegt90t]

moter

thanks that helps me out

[dirttrackegt90t]

fresh rebuild on lower end and a new head shaved 15.ths and cam up grade and the valLy pan out of a pro. .. header with 2,1/4 exaust pipe alu flywheel and a stage 3 racing clutch...i think i might have a little more hp//lol i hope. thanks for all the help. what will that vally pan out of a pro. do for me ? if there is any thing else i can do please let me know ... thanks TONY