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Author Topic: Upgrading my 1915  (Read 6040 times)
Erlend / bug66
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« on: October 26, 2011, 12:49:55 pm »
Hi

I'm upgrading my 1915 this winter..

Going from:               To:

Mahle 94               Mahle 94
Stock crank               DPR 69mm
Stock rods               CB Super Race 5,4” H-beam rods
Lightend flywheel            same flywheel
35,5x32 heads               044 Wedgeport 44/37 or 42/37
web 109               Web 86CorB (CB two piece lifters)
10-1 CR                  11-1 CR
weber 40 idf               48 IDA


What do you guys think? It's going to be a street/strip, needs to be able to ride to work (show off Grin ) but SCC will be it's glory.

No, I'm not buying JPM raptor Kalle Wink Need to be able to afford other things (got a car #2, bike etc)
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
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BeetleBug
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« Reply #1 on: October 26, 2011, 12:52:07 pm »
 Grin

It`s hard to beat the 86C.

But more importantly is that you build something that can match the BIG heads you`re planing to use.

BB
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Erlend / bug66
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« Reply #2 on: October 26, 2011, 12:58:58 pm »
Quote from: BeetleBug on October 26, 2011, 12:52:07 pm
Grin

It`s hard to beat the 86C.

But more importantly is that you build something that can match the BIG heads you`re planing to use.

BB

11-1 and cam? 42 vents, shortend intake runners
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
TexasTom
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« Reply #3 on: October 26, 2011, 16:37:34 pm »
If you're switching cranks, why not go with a 74?
Easier to make compression, minimaL shims, extra torque, more air flowing to make those ports work ...
 Huh
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Erlend / bug66
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« Reply #4 on: October 26, 2011, 18:04:50 pm »
It's staying as a 1915 Wink
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
TexasTom
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12.58@106, 7.89@89 Texas Motorplex 10/18/09
« Reply #5 on: October 26, 2011, 18:08:32 pm »
Just curious ... figured you had a reason.

I'd at least go with the smaller intake valve, 42.
Its gonna rev to the Moon! Wink
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Torben Alstrup
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« Reply #6 on: October 26, 2011, 18:38:33 pm »
Wedge´s are too big. Stay Mini Wedge w. 42/37 and that thing will buzz.
Your largest challenge will be getting enough compression. Those heads needs to be flycut DEEP! and then you will run into piston to valve clearance problems.
OR call Steve Timms or Denham and ask to have made a set that suit your needs. Might be a better solution when you want to stay 1914.

T
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Erlend / bug66
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« Reply #7 on: October 27, 2011, 00:23:11 am »
Quote from: TexasTom on October 26, 2011, 18:08:32 pm
Just curious ... figured you had a reason. Yup: dare to be different Cheesy

I'd at least go with the smaller intake valve, 42.
Its gonna rev to the Moon! Wink Hope so!
Logged
The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
Erlend / bug66
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« Reply #8 on: October 27, 2011, 00:24:00 am »
Quote from: Torben Alstrup on October 26, 2011, 18:38:33 pm
Wedge´s are too big. Stay Mini Wedge w. 42/37 and that thing will buzz.
Your largest challenge will be getting enough compression. Those heads needs to be flycut DEEP! and then you will run into piston to valve clearance problems.
OR call Steve Timms or Denham and ask to have made a set that suit your needs. Might be a better solution when you want to stay 1914.

T

Why? Airspeed?
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
Zach Gomulka
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Don't piss down my back and tell me it's raining.
« Reply #9 on: October 27, 2011, 01:57:49 am »
Quote from: TexasTom on October 26, 2011, 16:37:34 pm
If you're switching cranks, why not go with a 74?
Easier to make compression, minimaL shims, extra torque, more air flowing to make those ports work ...
 Huh

Agreed!
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Born in the '80s, stuck in the '70s.
Erlend / bug66
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« Reply #10 on: October 27, 2011, 09:34:51 am »
It's staying as a sub-2L, only because I'm stubborn Tongue

So the 44/37 won't flow as good, because the motor won't pull enough AF-mix through the heads? (because of low airspeed)??
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
andy M.
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« Reply #11 on: October 27, 2011, 10:48:57 am »
Having had a little experience running a hi po 1914 I can see little wrong with your intended spec, my car runs 44 x 37 valves, fk 89 and 11.5-1 comp on the street and runs nice and cool on the way to work and back, and with a set of slicks on there it's knocking on the door of an 11 sec quarter. Admittedly it is quite light though...

Andy
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BeetleBug
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« Reply #12 on: October 27, 2011, 11:21:31 am »
Car # 2 in this video has a 1915 ccm engine: http://www.facebook.com/photo.php?v=10150354696368350 180.8hp and it sounds really nice!
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Erlend / bug66
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« Reply #13 on: October 27, 2011, 13:20:14 pm »
Quote from: andy M. on October 27, 2011, 10:48:57 am
Having had a little experience running a hi po 1914 I can see little wrong with your intended spec, my car runs 44 x 37 valves, fk 89 and 11.5-1 comp on the street and runs nice and cool on the way to work and back, and with a set of slicks on there it's knocking on the door of an 11 sec quarter. Admittedly it is quite light though...

Andy

What pistons? Notched?
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
andy M.
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« Reply #14 on: October 27, 2011, 15:54:37 pm »
mahle with a notch, can't remember how deep, valves are ti with jpm springs and retainers,

andy
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Erlend / bug66
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« Reply #15 on: October 28, 2011, 06:33:15 am »
I think I need to notch the pistons, or weld and reshape chamber to raise the CR.
Logged
The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
Erlend / bug66
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« Reply #16 on: October 28, 2011, 15:40:57 pm »
Is there any way other then a mock up to figure out how much I need to notch? Even that is probably a game of chance?
Logged
The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
andy M.
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« Reply #17 on: October 29, 2011, 17:59:58 pm »
First off you'll need to get the heads flycut for your desired compression ratio, then mock it up and see what happens, you might get away without notching but I doubt it,  my old set up with a 10.5 -1 ratio needed notching,

what happens with your set up all depends on lift and other variables.

andy
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Erlend / bug66
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« Reply #18 on: October 29, 2011, 18:13:52 pm »
Not my first engine, and I'll mock it all up. Can't wait!

Can we see 90bhp pr litre?
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
andy M.
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Posts: 323



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« Reply #19 on: October 29, 2011, 19:44:10 pm »
that should be more than feasible
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L.B.C.R.
Erlend / bug66
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« Reply #20 on: November 01, 2011, 13:13:35 pm »
whould my little 1915 flow enough through a 44mm intake valve, or should I use a 42mm valve and get some more speed through the valve. the manifolds will be shortened and ported all the way up to the carb.

hmm  Undecided
Logged
The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018

The '59:
Not yet..
Speed-demon
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Posts: 65
« Reply #21 on: November 02, 2011, 09:16:43 am »
why not buy a set of steve tims stage 2s they are 42mm.
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