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Well, the "budget stroker" is getting boring. Even with the 2.93, it pulls great for an m20 after the compression raise. It's about 9:1 now, only slightly higher than a stock b25, soooo.
I picked up a seta m20 and used the head for the casting on a jobber. Also have a nice low mileage head that will get rebuilt and shaved, but since the head is going to the machine shop, figured the block might as well too. So, took apart 2 m20's to get the eta rods/crank and i pistons. The block is going to get decked 2.5mm or so depending on the height of the head after it's cleaned up. This will give about 10:1 or so depending on what's taken off the head vs block since the block machining raises the CR higher than machining the head, the chamber gets smaller as the head height is decreased. Cam is yet to be decided, but this is a common setup with good results, should be close to 200 at the crank, it's been proven to yield 175-ish WHP with the stock software and 288 cam.
This will happen over time, haven't ordered the rings, bearings, cam etc until all the cleaning/machining is done. We also have another e30 sedan being built that's priority over the Delphin car (24v swap for the sedan), as the Delphin car runs great as it sits. Just have a bad feeling about the block surface since it's developed yet another oil leak between the head and block. The new block will have a fresh deck surface to eliminate this (not just the head this round). Since the new car is getting boost, the Delphin car will stay N/A m20-powered.
Anyways, obligatory pics. Nothing pretty yet, spending time on personal cars at the shop is limited. Customers generally don't like seeing you work on your own stuff lol. seta block was completely torn down and the b25 had the pistons pulled. Hopefully the seta block will pass for tolerances and the b25 block doesn't have to come apart to replace it.
I picked up a seta m20 and used the head for the casting on a jobber. Also have a nice low mileage head that will get rebuilt and shaved, but since the head is going to the machine shop, figured the block might as well too. So, took apart 2 m20's to get the eta rods/crank and i pistons. The block is going to get decked 2.5mm or so depending on the height of the head after it's cleaned up. This will give about 10:1 or so depending on what's taken off the head vs block since the block machining raises the CR higher than machining the head, the chamber gets smaller as the head height is decreased. Cam is yet to be decided, but this is a common setup with good results, should be close to 200 at the crank, it's been proven to yield 175-ish WHP with the stock software and 288 cam.
This will happen over time, haven't ordered the rings, bearings, cam etc until all the cleaning/machining is done. We also have another e30 sedan being built that's priority over the Delphin car (24v swap for the sedan), as the Delphin car runs great as it sits. Just have a bad feeling about the block surface since it's developed yet another oil leak between the head and block. The new block will have a fresh deck surface to eliminate this (not just the head this round). Since the new car is getting boost, the Delphin car will stay N/A m20-powered.
Anyways, obligatory pics. Nothing pretty yet, spending time on personal cars at the shop is limited. Customers generally don't like seeing you work on your own stuff lol. seta block was completely torn down and the b25 had the pistons pulled. Hopefully the seta block will pass for tolerances and the b25 block doesn't have to come apart to replace it.
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