Unknown 2.7 Engine

[Nditiz1]

What can I tell about this engine rebuild from the outside?

Its a 2.7 from a 76 - 6462161
It appears to have the gold sprocket pickup for EFI.
Throttle bodies look to be EFI - does only PMO make these?
No carrera oil fed chain tensions present.

I realize I won't know about cams unless I crack it open OR measure the lift

Can I tell anything about the cylinders used? Looks like they have an A stamped. Is that for Ausil?

[colingreene]

pictures would help.
but you wont really know anything till you pull the cam and heads probably also do a leak down test first.

[Nditiz1]

@colingreene

Added some pics. I also got in touch with Ollie's who did some of the work. Looks like the heads have been machined for Twin plug. Is that how most/all EFI's are set up?

[Walt Fricke]

Twin plugging allows you to run a higher compression ratio than otherwise you could on whatever fuel you plan to use.

It is simple to remove one of the chain box covers to see what, if anything, is stamped on the end of the cam. Might tell you something, might not tell anything.

For not much money you can purchase the device which can be used to measure the displacement. Best done with the engine like it is now - not in the car - because you need to remove the rocker arms from the cylinder you chose to test. The displacement checker is like a large syringe, with gradations on its clear cylindrical outside. You screw a hose into a spark plug hole, the hose connects to the cylinder's bottom, you push the "plunger" part down to zero, and then turn your engine over a couple of times. The plunger ends up at a point where it indicates your displacement.

Though if Ollies knows the bore and stroke, you have that down. Maybe they know valve sizes (were larger ones installed?). If you pull one of the intake manifolds (easy to do) you can measure the port size (looks like no header on the exhaust so that's easy to measure). Look at the pistons with a borescope - do they look like CIS pistons, or something aftermarket?

If know the displacement, you can buy or borrow a burette and use Marvel Mystery Oil to figure your compression ratio through a spark plug hole.

How did this fall off a turnip truck in your back yard, with no history?

[al lkosmal]

The ITBs are Triumph Speed Triples........on Closed Course Motorsports (Clay O's) manifolds.
So it is likely either Clay or i provided these ITBs..................

regards,
al

[911pcars]

I'd do the easy inspection procedures first - a compression test. If it's below spec, would your interest be as high? Borrow a gearbox case and use that to mount a starter motor. Perform dry and wet compression tests. If it passes, open up the valve and chainbox covers and take a look at the condition of the cams, rockers, etc. If it doesn't, can follow up with a leakdown test to pinpoint the rebuild area.

Still curious? Remove the cam housing and a cylinder head and take a look at the valves, ports, valve guides, machined surface and compute compression ratio. Going further, slip a cylinder off and inspect it, the rings, ring lands, con rods/bearings and rod journals.

If all is okay, it's an engine gasket set and the labor to reassemble. The depth of your inspection might correlate with the cost of the engine.

Sherwood