GS1100g top end on GS1000

[robertob]

I know this has been brought up before, but I can't figure out if I can run a GS1100g barrel & pistons on a GS1000 8-valve. I know the G has a longer stroke (by 2mm, I think), but is the difference in the pistons, rods, cylinder or all three?

I've got a set of GS1100G cylinders sitting here that I'd love to use if I can...

[phaserburn]

Hey,

I am actually looking to do the same thing.

Have a look here:

http://www.thegsresources.com/_forum/showthread.php?t=1210

[first timer]

I have heard the 1100g head can fit on the 1000 block.

[robertob]

So I did some measuring just to see how it works out.

Catalog data:

GS1000 = 70mm bore X 64.8mm stroke, 997cc
GS1100g = 72mm bore X 66mm stroke, 1074cc

Measured data:
GS1100 = 72mm piston, 18mm pin, 26mm deck (center-top), 88mm cylinder height
GS1000 = 70mm piston, 18mm pin, 26mm deck (center-top), approx 88mm cylinder height (don't have one to check)

So it looks like the GS1100 cylinder will work, but I'd hone it and run new rings to get the best ring seal.


The resulting displacement will be only 1050cc, though, so I don't know if it's worth it. I wonder what compression is?

[srsupertrap]

So I did some measuring just to see how it works out.

Catalog data:

GS1000 = 70mm bore X 64.8mm stroke, 997cc
GS1100g = 72mm bore X 66mm stroke, 1074cc

Measured data:
GS1100 = 72mm piston, 18mm pin, 26mm deck (center-top), 88mm cylinder height
GS1000 = 70mm piston, 18mm pin, 26mm deck (center-top), approx 88mm cylinder height (don't have one to check)

So it looks like the GS1100 cylinder will work, but I'd hone it and run new rings to get the best ring seal.


The resulting displacement will be only 1050cc, though, so I don't know if it's worth it. I wonder what compression is?

Can anyone explain the 26mm deck (center-top) measurement listed above?

[salty_monk]

Centre of the pin to top of the piston?

[srsupertrap]

Dan, I think you are right.

I went over Tom's (Tkent02) garage and we took some measurements of my GS1100G and one of Tom's GS1000E cylinder block. The cylinder height was measured from the base gasket surface to the head gasket surface with a digital caliper. Note: The GS1100G measurement includes the thickness of the base gasket (.35 - .50mm). It's stuck on pretty good after 27 years

Measured Data:
GS1000E: 86.8 to 86.9mm
GS1100G: 87.4 to 87.5mm with Gasket

[7981GS]

Two threads running at the same time on the same subject?

http://www.thegsresources.com/_forum/showthread.php?t=149275

Dan

[srsupertrap]

No, I searched and found both and decided to resurrect them since neither thread came to a conclusion. I have a GS1100G head and like Kochic I am interested in using a GS1100G cylinder for a larger bore Wiseco pistons, 73.5mm in my case.

7981GS,
Can you take a height measurement of one of your GS1100G cylinders with a digital caliper or a micrometer? My measurement above includes the base gasket and I am interested to see how your measurement compares to the GS1000E cylinder measurement of 86.8 to 86.9mm. I took the measurement at the ends of the cylinders.

TIA
Steve

[gshub]

No, I searched and found both and decided to resurrect them since neither thread came to a conclusion. I have a GS1100G head and like Kochic I am interested in using a GS1100G cylinder for a larger bore Wiseco pistons, 73.5mm in my case.

7981GS,
Can you take a height measurement of one of your GS1100G cylinders with a digital caliper or a micrometer? My measurement above includes the base gasket and I am interested to see how your measurement compares to the GS1000E cylinder measurement of 86.8 to 86.9mm. I took the measurement at the ends of the cylinders.

TIA
Steve

Gs1085 -73mm ,73.5mm is a 1100kit.

[srsupertrap]

Gs1085 -73mm ,73.5mm is a 1100kit.

gshub,
You are right those are pistons sizes. I am actually interested in the GS1000 & GS1100g cylinder height (not bore) measured from the base gasket surface to the head gasket surface with a digital caliper.

[7981GS]

gshub,
You are right those are pistons sizes. I am actually interested in the GS1000 & GS1100g cylinder height (not bore) measured from the base gasket surface to the head gasket surface with a digital caliper.

I just saw this, I'll try to measure them for you when we get back from Church.

Daniel

[7981GS]

Deck height, is .020 higher on the 1074 cylinder Vs. the 997 cylinder.

Daniel

[gs1428]

bolt it togather. done many of them. big incrae for little effort

[Big Jay]

People are using our 75 mm pistons with the 1100g set up. Bores right in. 1166cc

http://gszone.biz/