CB Gas Saver engine kit

[CarreraRS2.7]

I noticed CB has added a 1904cc Gas Saver kit to their Builder's Choice engine kits. Has anyone built one of these or have any opinions on this kit?

http://www.cbperformance.com/ProductDetails.asp?ProductCode=1179
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If at first you don't succeed, skydiving is not for you.

Gigi: Saturn Yellow 1974 Karmann Ghia Cabriolet

El Barto: Rosso 2017 Fiat 500 Abarth

[bugguy1967]

It's just an engine. There's no magic in there. You could find out the specs and build with whatever parts you choose. The upside of the kit is that the homework is done for you. Just assemble.

I wonder if a Bug would be more drive able with a longer stroke and smaller pistons. Say 82x85.5 B. a little less ccs, but possibly more bottom end to move the vehicle through that final gear easier.
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"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"

[mark tucker]

how would a 82x85.5 make a bug more drivable?

[bugguy1967]

I mean more go with less pedal. Not driveability. I'm thinking a longer stroke/similar cc engine will develop more torque in the 3000 rpm range than the 74 crank.
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"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"

[Alstrup]

82 or up to 86 x 85,5 or up to 88 mm bore has been done plenty. And the end result is still the same, - for street engines, not the best set up, due to a very uneven the power/torque curve. For race engines with limitations in bore it is a solution it is a different matter.

74 or 76 x your choice of bore can work very well.

T

[Quokka42]

Here we see the problem with dyno data (real or software) versus real world.

An undersquare (or just squarer than stock in our VW case) engine can perform well when torque and economy are the goal if it is built correctly, but the WOT curves are not what are desired for drag racing which is what Alstrup is noting. They are even better for constant speed applications such as aricraft and stationary engines.

The throttle response at lower engine speeds is certainly better when you get it right.
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There has only ever been one man who was perfect, and they nailed Him to a cross.

[CarreraRS2.7]

Low end torque and fuel economy are my primary concerns. My current plan is to build the small-bore stroker motor from Aircooled.Net's mileage engine article, but the simplicity of CB's all inclusive kit is very appealing.
_________________
If at first you don't succeed, skydiving is not for you.

Gigi: Saturn Yellow 1974 Karmann Ghia Cabriolet

El Barto: Rosso 2017 Fiat 500 Abarth

[heimlich]

Did you build this engine? I was looking into this one as well and wanted some opinions.

[jpaull]

Would be So tempting to spend 30% more cash and get 100% more Torque/Power With one of the larger kits.
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[email protected] MPH 1/4 Mile & 8.1 @ 83.7MPH in 1/8 Mile with Mild Type 1 VW Mag Case 2234cc commuter engine in stock weight bug w/only .491 total lift(CB2292 Cam), 42x37 heads, 48idf's, Street tires, Belt on, Mufflers, Pump gas, video of the run here: https://youtu.be/M3SPqMOKAOg

Transmission by MCMScott:
Rhino case, Klinkenberg 4.12, Superdiff, 002 mainshaft with 091 first idler. Weddle 1.48 Third & 1.14 Fourth.

[heimlich]

I hear you. I'm just looking for a stock setup.

I'm just thinking about it all right now anyways. A new engine is expensive.