[GTJIM (R.I.P.)]

Measuring up

Well "madhatterpds" here follows a few random pics of my GT Project:

Neon H-beam rods and 305 Chevy 6" rod pistons (KB 153) hypereutectic - for my 2.2litre bored & stroked 1900

 

[GTJIM (R.I.P.)]

More Boring Jim Stuff

1.5 litre head with 1.72" Intakes and 1.5" Exhausts in one chamber with the standard valves for comparisson:

 

[GTJIM (R.I.P.)]

More GT Stuff

under view of 305 Chevy 6" rod pistons with 1.260" pin height.
Note how the pin hole impinges on the lower edge of the oil ring groove. There is a steel pin to stop the lower rail from rotating so tha tit will bridge the gap. The manufacturers seem confident it works!!

 

[GTJIM (R.I.P.)]

Still more - You Asked for It!

Aussie Toranas 1900 Opel Exhaust manifold. Nice and swept back with almost equal length tubes and large flange (1 7/8")

 

[GTJIM (R.I.P.)]

No More after this one

The 1972 GT motor on the shop floor with a twin cam G200W)Isuzu motor behind it - there is an Isuzu Turbo (4ZC1) just to the left out of frame. 180 PS and nice fuel injected turbo on it just about the right size for an Opel engine - has a good Nissan-Warner 4-speed auto trans withit too.

 

[jordan]

will you have to do any crank work to make the neon rods and 305 pistons turn into a 2.2?

 

[GTJIM (R.I.P.)]

Crankshaft

Jordan Et Al,

The crankshaft rod journals need to be "offset" ground to increase the stroke from 69.8mm to 77.5 mm which is the standard 2.2 litre stroke. The Neon rods are to help this process by having a rod journal diameter of 1.889" (48mm) compared to the Opel at 2.047" (52mm). This allows the rod journal to be moved almost 4mm by grinding almost nothing off one side of the crankshaft and 4mm off the other. Fortunately it is the side opposite the oil hole that has the metal removed.

77.5 - 69.8 = 7.7mm stroke increase so journal centre line needs to be moved half that much as the stroke is increased both going up more and coming down the same amount ie: 3.85mm so there is a wee bit to play with. Also using .25mm undersize Neon Rod bearings to give a wee bit more whoa come hither.

It all works out on paper but I am eager to see it all come together in reality. if it does not then it will have been some expensive fun. I have had some extremely good service from Marshall Campbell at www.campbellenterprises.com
who has shipped the neon H-beam rods, the Keith Black 'Silv-O-Lite hypereutectic Pistons (KB-153), Molly Rings and Neon Rod bearings to me in New Zealand. His prices were extremely competitive AND he shipped to N.Z. in five days!

Everyone is away at the Beach in New Zealand at the moment, for the Summer holidays so I am waiting for the machine shops to open again and get up to speed on the 19th January. Though I return to work on the 12th. For three to four weeks in mid-Summer down under everyone heads for the Beach, Beer and Babes and are always reluctant to return to work!

 

[Gary]

Re: Crankshaft

.....Everyone is away at the Beach in New Zealand at the moment, for the Summer holidays so I am waiting for the machine shops to open again and get up to speed on the 19th January. Though I return to work on the 12th. For three to four weeks in mid-Summer down under everyone heads for the Beach, Beer and Babes and are always reluctant to return to work!

Gary's jealous ..... It was 3°F here last night and I'm 20 minutes from the beach.

 

[GTJIM (R.I.P.)]

Jealous!

34 degrees Celsius here last night - I'll send you some heat rash and hay fever if you like!

 

[jordan]

-6ºf last night with the windchill taking it to -10ºf. its nice today, almost 20ºf. (the shop was 15ºf when I was wetsanding)