Fiat X1/9 X19 128 sohc engine pistons High compression (Borgo 66.6298.0 ) 86.4mm
- ConditionBrand new
- Make / brandBorgo
- ModelX1/9,128
- Part number66.6298.0.D
- LocationWA
- SellerThe FIAT Factory
- Shipping$30
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Description
OEM BORGO brand piston sets to suit the Fiat SOHC engine found in Fiat 128 Coupe 128 Rally 128 3P and Fiat X19 1300. 86.4mm bore size set of four pistons / rings / gudgeon pins / clips Can also be used as a high compression alternative in 1500 SOHC engines as well. 34.7CH, 0.6 mm dome, small valve flycuts. standard compression for the european specification of this engine in post 1974 European spec 1300 is 9.2:1 86.4mm is a 0.4mm over size for the SOHC 1290cc engine found in Fiat 128 sport coupe, 128 Rally, 128 3P and X1/9 1300. 86.4mm is standard size for the SOHC 1495cc engine found in Fiat X1/9 series 2 for which this piston would be a high compression alternative Full Chromed top ring. Very high quality, Italian made. Fresh sealed boxes, NOS, have been sitting on a shelf for over 30 years This listing is for ONE box with a set of 4 pistons fitted with rings and gudgeon pins as in the picture. If you want a postage estimate to your country, just ask. Theoretical static CR in a 1500. A basic compression ratio calculation looks like this: Volume at BDC is (swept volume + minus deck volume - dome )+ flycut volume + ring land clearance volume + gasket volume + chamber volume. Volume at TDC is (volume in gasket - pop up - dome) + flycut volume + ring land clearance volume + chamber volume. Volume of BDC over Volume at TDC is expressed as a ratio to one (xx:1) Assume bore is 87.00 These Pistons are 86.50 above the top ring land and the top ring groove is 7mm down from the crown. The Valve Flycut volume is approx 1.0cc The Piston sits at approx 0.3mm minus deck The dome is 0.6mm high, 36.5mm in diameter and a "spherical cap" in shape. The Nominal Combustion Chamber volume is 33cc (non decompression recess head) Your head gasket is going to be 1.2mm compressed and has an inside fire ring diameter of 87.2mm and will give a SQ clearance of 1.5mm So let's do some math... Swept Volume of the cylinder. Pi x R squared x Stroke 3.14285 x (43.5 x 43.5) x 63.9 3.14285 x 1892.25 x 63.9 380.017cc Volume of the piston 'minus deck' 3.14285 x (43.25 x 43.25) x -0.3 3.14285 x 1870.5625 x -0.3 -1.765cc Volume of the 'spherical cap'. [3.14285 x (0.6 x 0.6) x (3 x 18.25 - 0.6)] / 3 [3.14285 x 0.36 x 54.15] / 3 0.204cc Volume of the head gasket. 3.14285 x (43.6 x 43.6) x 1.2 3.14285 x 1900.96 x 1.2 7.17cc Volume of the ring land clearance. [3.14285 x (43.5 x 43.5) x 7] - [3.14285 x (43.25 x 43.25) x 7] [3.14285 x 1892.25 x 7] - [3.14285 x 1870.5625 x 7] 41.63cc - 41.15cc 0.48cc and then put these numbers into the equation, Volume at BDC = (380.017 + 1.765 - 0.20) + 1 + 0.48 + 7.17 + 33 = 423.232 Volume at TDC = (7.17 + 1.765 - 0.2) + 1 + 0.48 + 33 = 43.215 V at BDC / V at TDC = 9.8:1 (9.79363) ARP head stud and main stud kits, GMB water pumps, OE Fiat oil pumps, Graf timing and oil pump drive gears, Akron silicone engine seals, Pirelli timing belts, Fitchel and Sachs clutches and much more, just enquire. For buyers within Australia payment by bank direct deposit is preferred. Brand New. Manufacturer part number 66.6298.0.D. Suits X1/9, 128. Available from The FIAT Factory through the club marketplace. Message the seller through this page, or open the listing on eBay using the link above. Model and part-number details are taken from the seller's listing as a search aid. They are not a guarantee that the part fits your car, so please check with the seller before buying.
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