Started by Ascari32, July 14, 2020, 09:40:13 PM
Quote from: sportiva on August 02, 2020, 08:08:16 AMFound a badge for your car that was assembled in Pomigliano d'Arco by F.I.A.T SPA
Quote from: torquemeister on November 14, 2020, 06:43:58 PMQuote from: sportiva on August 02, 2020, 08:08:16 AMFound a badge for your car that was assembled in Pomigliano d'Arco by F.I.A.T SPA Lets be clear - Alfa took the small bore GM block and developed their own variable multivalve heads for it. A former colleague was a design engineer at GM Elizabeth at the time and he said when the first units were shipped back to GM Oz for review the engineers complained that Alfa had done what they had not been able. SIDI was a result or Alfas work. People get misty eyed over the Busso but it could not meet EU emissions compliance so naturally Alfa had to cast about within GM and come up with a solution.Comments re 600HP out of the engine? Seriously? Its well known that the AutoDelta SC kit boosts HP but at the expense of the transmission. So there is NO WAY that you can put down 600HP in that 939 Series configuration without major rework of the entire driveline.Let's also be clear about the pedigree of this engine. The team that developed the V6 engine for Ford/Jaguar had been broken up when the project ended. Porsche were heavily involved with it, to the extent they still hold patents on elements of its design. Ex - members of the team became involved with the new engine GM wanted develop, in which Holden also played a part.It is a testament to it's design that Alfa chose to use it, but to be honest they were over a barrel given their engine plant was being closed. So in essence, to claim it as their own, and given the reputation the Busso had, it had to be radically different. However, the block is a modular design, in this instance specified as 3.2 litre. But it is not true they developed/modified the block further. The heads yes, with all components already available on the market - V.V.T's included. So apart from recasting the heads, little design work went into the Alfa 3.2 JTS.To add to the woes the lower timing chain tensioner suffered was the spray jets which bleed oil from the main gallery and further reduce the supply to the tensioner. Not only that, they are low pressure and are known to jam open, allowing the block to bleed down when the engine is switched off.Oil pressure in the Vauxhall 2.8 Insignia turbo, the Opel and SAAB turbos, do not suffer quite so badly as an extra oil feed is taken from the Oil Cooler/Filter housing to the turbo. There is a "Boss" on the Oil Cooler/Filter housing, which is left undrilled on the Alfa.Had Alfa thought more seriously about how to make the VVT's work properly, not to mention the rear timing chain tensioner, they would have used this Boss as a supplementary feed for the block. One simple Oil Line would have cured the problem of lower timing chain tension, rear bank upper timing chain tension and balanced the feed pressure for the VVT's on both banks.
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