Max Compression Easily Attainable for NA on e85
#1
Max Compression Easily Attainable for NA on e85
Hi,
What is the max compression ratio that is easily attainable on a naturally aspirated motor? For use with e85 on a dedicated track car.
By easily attainable I mean off the shelf or custom but existing (& ideally 85.5mm) pistons, and sensible amounts of head/block skimming that don't cause other issues.
Cheers.
What is the max compression ratio that is easily attainable on a naturally aspirated motor? For use with e85 on a dedicated track car.
By easily attainable I mean off the shelf or custom but existing (& ideally 85.5mm) pistons, and sensible amounts of head/block skimming that don't cause other issues.
Cheers.
#3
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I'm not sure if I've seen any over 11:1. This guy is running11:1
on corn juice and boost.
https://www.miataturbo.net/build-thr...-thread-80256/
on corn juice and boost.
https://www.miataturbo.net/build-thr...-thread-80256/
#4
According to this guy, you can shave the head roughly .080" with a stock 2001+ bottom end and a BP4W head. Internet wisdom for head shaving says that should be roughly 12:1.
My 172whp N/A Engine. Stock bottom end. No Porting. - MX-5 Miata Forum
I'm about to drop a .060" shaved VVT head in my car with E85, but I won't have any dyno results for a month or two.
My 172whp N/A Engine. Stock bottom end. No Porting. - MX-5 Miata Forum
I'm about to drop a .060" shaved VVT head in my car with E85, but I won't have any dyno results for a month or two.
#5
As much as you can fit in there. Id probably call up weisco and have them make you some 12:1 slugs and then clay it and see how much you can take off the head with the cams you will use. If i had to put a number on it, you'd probably end up around 13:1. It gets pretty tight in there with high lift cams.
Too much work? Here are easy off the shelf pistons
TMD CCP0001 TMD Racing Forged Aluminum Piston. from the EPMiata.Com Online Store!
Too much work? Here are easy off the shelf pistons
TMD CCP0001 TMD Racing Forged Aluminum Piston. from the EPMiata.Com Online Store!
#13
@Neddy wich Motor do you have ?
Does it make sence to go 13:1 on a 94 1.8 stock Engine Na Miata exept skimming ....I guess no....
Depends on your entire Setup if such cr ratio make sence or not
Sorry my english isn't the best ,so if i understood something wrong please tell me
Does it make sence to go 13:1 on a 94 1.8 stock Engine Na Miata exept skimming ....I guess no....
Depends on your entire Setup if such cr ratio make sence or not
Sorry my english isn't the best ,so if i understood something wrong please tell me
Keeping in mind e85 is readily available, to me it makes perfect sense
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