Discussion
Anyone interested in a small mod to their 2.9 ? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=320160097669&ssPageName=ADME:B:SS:UK:1
The 2.8 engine has a stroke of 68.5mm, and the 2.9 a stroke of 72mm. To increase capacity to 3.5 litres requires a stroke of 86mm (for the same bore size). The increased stroke is accommodated in the standard block by either shorter conrods or shorter pistons (from the crown to the gudgeon pin). In this case it sounds like standard rods are used and the stroke is accommodated by a change in the piston height.
As to the result, according to Specialised Engines (the Ford engine reconditioning experts), Quote:
3.5 & 3.6 Conversion
When we first produced the 3.0 - 3.1+ conversions in 1988, our main concern was for reliability and smoothness, closely followed by improvements in both torque and BHP, aligned with reasonable fuel consumption and price. All this equal a good fast road car - not and unreliable 'cammy' and 'juicy' semi-race type.
We believe we achieved all our aims.
In developing the 3.5 - 3.6 range, we hoped for similar gains. Initially we tested three 'stroker' crankshafts of 84, 85 and 86mm, with various bore sizes.
All gave considerable gains in torque, but small, rather disappointing gains in BHP compared to 3.0+ and 3.1+ engines, due to the restrictions imposed by the standard electronic fuel injection system (EFI) used by Ford. Although with carburettored or earlier Bosch type injection systems, BHP is improved.
We can supply a remapped addition to the EFI system at an extra cost of £200.00 + VAT (Fitted).
We have found that a stroker crankshaft of 84.32mm, with a choice of bore sizes as above giving 3.5 to 3.6 litre is the most reliable and fuel efficient of these conversions.
ENGINE PRICED FROM : £3879.00, Unquote.
Of course there's no telling if the conversion kit in question has similar characteristics.
As to the result, according to Specialised Engines (the Ford engine reconditioning experts), Quote:
3.5 & 3.6 Conversion
When we first produced the 3.0 - 3.1+ conversions in 1988, our main concern was for reliability and smoothness, closely followed by improvements in both torque and BHP, aligned with reasonable fuel consumption and price. All this equal a good fast road car - not and unreliable 'cammy' and 'juicy' semi-race type.
We believe we achieved all our aims.
In developing the 3.5 - 3.6 range, we hoped for similar gains. Initially we tested three 'stroker' crankshafts of 84, 85 and 86mm, with various bore sizes.
All gave considerable gains in torque, but small, rather disappointing gains in BHP compared to 3.0+ and 3.1+ engines, due to the restrictions imposed by the standard electronic fuel injection system (EFI) used by Ford. Although with carburettored or earlier Bosch type injection systems, BHP is improved.
We can supply a remapped addition to the EFI system at an extra cost of £200.00 + VAT (Fitted).
We have found that a stroker crankshaft of 84.32mm, with a choice of bore sizes as above giving 3.5 to 3.6 litre is the most reliable and fuel efficient of these conversions.
ENGINE PRICED FROM : £3879.00, Unquote.
Of course there's no telling if the conversion kit in question has similar characteristics.
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