M20B25 block, M52B28 crank, 130mm rods, stock M20B25 pistons.
My math says piston should be 0.5mm below deck at TDC. This is #1 at TDC. Doesn't look below deck.
Our cam has extra...
dvallis
E30 Fanatic
Last Activity: Today, 10:18 AM
Joined: 10-17-2015
Location: Austin, TX
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Timing Belt Horror
Belt on left is brand new Gates T131RB 127 tooth belt.
Belt on right is random 127 tooth. Was pulled from Das Beast. Motor literally ate half the width after 22 laps.
WTF is... -
A few more rebuild pictures
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GT3076R aka GT30R ball bearing water cooled turbo rated for 525 HP on re-flanged downpipe.
Compressor: 4" inlet, 2" outlet, 0.64 A/R, 57 mm inducer, 76 mm exducer, trim 56
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Compressor wheel and plate sold.Leave a comment:
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Dyno tune for sure. Back to Roman at Boost Logic. I ran into him yesterday dropping off the downpipe for its GT30R refit at an independent TIG shop. He was happy to see us going GT30R. Haven't told him...Leave a comment:
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Right. We're at 150 psi static compression.
This is a great post. Totally changed my thoughts on the head gasket. Called VAC back and changed to a 0.040. Should have a 10:1 compression ratio...Leave a comment:
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We're running an 885 head with 284/272 cam, 0.050 lift over stock. Pistons are 0.5 mm below head deck due to 130mm eta rods. Measured 0.150 clearance (clay) piston to valve. Sounds like we could go 0.050...Leave a comment:
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I was concerned about detonation at high boost so went 0.120 on the first build. Like you said, wasn't an issue at 7.8. So we're back to 8.3 with the 0.98. Should make over 300HP at 10 psi. What are you...Leave a comment:
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New bitch tube with AN16 vent.. It's gonna breathe much better.
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VAC had an 85mm 0.098" in stock so I ordered it. Talked to a guy who sounded knowledgeable. He said 0.5mm outside the bore is fine. Had done it on many M20s. Dropping .022" from .0120"...Leave a comment:
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We could drill it, plug and grind holes but that sound like a PITA. Going with the modified cast pan for now. Long term I'm going to scan a pan flange, recreate in CAD and do a custom panLeave a comment:
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MLS head gaskets
Where is everyone getting their M20 MLS gaskets?
MLS head gasket from IE has gotten stupid expensive. ~$350 with shipping.
I'm only seeing 85mm bores from Cometic on their M... -
It's a vacuum and afr thing. The stock throttle body has inlets between it an the MAF, one of which goes to the valve cover. Open the oil cap and you change the volume of air from head to intake manifold...Leave a comment:
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I need one of these right now but we're using an M52B28 crank. Has an 85mm stroke vs 89.66 for the S52. Wonder if it's the same pattern?Leave a comment:
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All parts still available...Leave a comment:
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Das Beast Turbo Parts
Changing turbos on Das Beast. Selling off the PT6262 CEA. (Link to PTE specs)
Compressor housing is 0.7 A/R, 82 mm exducer, 4" inlet, 2.5" outlet. Ported
$200... -
Getting ready for engine pull.
Bitch tube mod in progress for improved crankcase breather. Will have AN16 fitting welded on end.
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We started with good compression on #1
But not so great on #4 and #5. Engine pull and teardown underway.
Most but not all of the 528e pan holes line...Leave a comment:
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