Just another 2056 build, Misc Questions Options

[sdoolin]

Yep, I am building a 2056. Have ordered very nearly a complete 2056 engine kit from Type IV Store (LN Engineering). Some questions (I have searched and read MANY threads)...

I have a "spare" 1976 VW Bus short block (no cyl. heads). Assume this will work for a starting point? Issues with oil dipstick? The bus was an automatic so I assume once I remove the "flex plate" that the flywheel from by 914 engine (in car) will bolt up to the crank without issues? Any issues with engine carrier? The bus used a "moustache bar" for mounting to the frame and I am hoping that the cases from the bus/914 are the same for engine mounting?

Will re-use existing Crank/rods
New crank/rod bearings
Will re-use existing cylinders (overbored)
KB 96 mm flat topped pistons with Hastings rings
Webcam cam (9130 kit from Type IV Store)
Type IV Store pushrods, pushrod ends, parkerized lifters, rocker shafts
Type IV Store cam bearings

Re-use rockers from bus engine? Not sure about this...

HAM (Len Hoffman) RS+ spec cylinder heads
New Oil pump from Type IV Store
New clutch & pressure plate.
Re-use flywheel from 914 engine (in the car)

Dellorto Dual 40mm carbs, CB Perf manifolds & linkage
SSI heat exchangers & Bursch exhaust
New fuel pump - will run return lines (have CFR SS Lines in car now and will re-use)

Not sure what dizzy to run?

I believe I need to check/verify deck height and valve clearance (I know how, just not positive this is required for a 2056 build).

I have read a few threads about "setting" compression ration, but do not understand it yet? Anyone have a compression ratio for dummies guide?

Anything else I'm missing?

Progress so far...

[Dave_Darling]

I have read a few threads about "setting" compression ration, but do not understand it yet?

You set the compression ratio by moving the cylinder heads outward (lowers compression) or inward (raises compression). Moving the heads out can be done by adding spacers under the cylinders. Moving them inward is usually done by fly-cutting the heads, though machining the cylinders probably can work too.

The simple version is that the compression ratio is the ratio of volume of the whole chamber plus cylinder at BDC to the volume of the same stuff at TDC. You can calculate that in a few ways, the most common is:
(swept_volume + fixed_volume) / (fixed_volume)

The swept volume is determined by the bore and stroke of one cylinder, with a 2056cc that would be (96/2)*(96/2) * 71 * 3.14159 / 1000 ~= 514cc. (Or 2056cc / 4.)

The fixed volume is measured in several parts that are added together. The combustion chamber volume is measured using your cylinder heads and your spark plugs and your valves and such. The height of the cylinder above the piston is measured, and used to calculate the volume of the space left above the piston. Dished or domed pistons get measured for volume (how depends on the piston) and that volume gets added to (dished) or subtracted from (domed) the fixed volume.

Then you plug the numbers in and see what your compression ratio is. Then see how much you need to add to the fixed volume to lower the number to where you want it, or how much you need to remove from the fixed volume to raise the number.


... Or you take the whole shebang to a good machine shop and tell them you want X for the compression ratio and they do it all for you... (IMG:style_emoticons/default/wink.gif)

--DD