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Old 10-10-2019, 02:43 PM   #1
neildrake
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Default B30 redblock Big Bore Head Gasket

A couple years ago I worked with Cometic to make a head gasket suitable for up to 93mm bore for my B30.
Finished the engine early this year and ended up with a 92mm bore and 6mm stroked motor which yielded approx 3.5l.

Cometic Part numbers are:
0.043" Thickness - PN H3270SP1043F
0.059" THickness - PN H3270SP1059F

Used an off the shelf Wiseco forged piston and Nascar Carrillo rods. Had to have crank welded, narrowed rod journals and reground to smaller diameter journal to accomplish but was happy with results.
https://www.youtube.com/watch?v=cV-Q1NaQOZk

Neil
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Old 10-10-2019, 03:29 PM   #2
dl242gt
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Sounds great! Looks like it's going to be a lot of fun in a car that barely weighs more than the engine.
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Old 10-10-2019, 03:36 PM   #3
hiperfauto
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Sounds awesome! It revs quick for a B30. What's the compression ratio?

What kind of car is it in, a Marcos?

NVM, I just saw your user profile:

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Old 10-10-2019, 06:53 PM   #4
oemoilleaks
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SOUNDS AMAZING!!! What is that gauge that's just floating there above the manifold?
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Old 10-10-2019, 07:28 PM   #5
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Awesome!
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Old 10-10-2019, 09:19 PM   #6
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That's pretty damn rowdy
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Old 10-10-2019, 09:27 PM   #7
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Old 10-10-2019, 11:11 PM   #8
neildrake
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Compression ratio is 11:1.
It picks up revs so quick mainly due to the lightweight flywheel and clutch. Turns out that a tilton 153T nascar flywheel for small ford will bolt to B30 with a few mods. Rods and pistons are a fair bit lighter than stock also.
The extra gauge was just oil pressure temporarily zip tied to intake during break in.
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Old 10-11-2019, 10:17 AM   #9
brian smith
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Awesome result, thanks for posting both the info and the video.
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Old 10-11-2019, 12:11 PM   #10
vwbusman66
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Wow.
Just wow.
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Old 10-11-2019, 12:12 PM   #11
JohnMc
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Hopefully you dyno it at some point. It always seems like the B30 doesn't 'scale' as you'd expect from a B20, but then people rarely go all out on a B30 build.
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Old 10-11-2019, 04:55 PM   #12
OttoB
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I got something like 185 hp out from my B30E with K-cam style camshaft, but it is not fully sorted out. Max torque comes in quite high rpm, so I might be cam timing issue or exhaust tuning thingy. I got std B30 E moose horns as exhaust manifolds
Before dyno, GT power simulation was made, giving quite close same performance results as dyno.
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Old 10-11-2019, 07:28 PM   #13
Tfrasca
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That is bad ass. What kind of power does it make?
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Old 10-11-2019, 07:36 PM   #14
neildrake
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Default Dyno TBD

Iíll post after it runs on dyno. Right now Iím gettin break-in miles on it before putting the second valve spring in. Also working on an FI setup. Weberís are great but think I can do better.
If someone can tell me how to post pics here I can show some more detail. Also running a quaife sequential gearbox thatís pretty fun.
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Old 10-16-2019, 02:28 PM   #15
klr142
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Beautiful! Looking forward to hearing and seeing more.
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