Torque had peaked but power was still rising.Īs you don't already have a plan and have had to ask it will cost lots. The dyno plot for JezH's 458.9bhp stopped at 7000rpm. The "ND550" engine was run to 9000 rpm (600bhp?) but I don't know what rpm the peak power was. There is a story of someone writing on a $0.5m jet engine casing made from Ti and all the middles fell out of the letters while being carried on a forklift.
Titanium has huge benefits in reducing reciprocating mass but at high cost. Reciprocating mass is taken as piston + rings + pin + upper 2/3 of rod. Basically keeping rpm x sqrt(reciprocating mass) = constant is neutral. Increase in rpm requires lighter piston and rods or will result in higher crank loads at TDC on exhaust stroke and BDC = reciprocating mass x stroke x rpm² and shorter life. Increase in rpm will give more power for same torque (BMEP). Torque requires high cylinder pressure which kills engines, every power stroke hammers the big end, makes the cylinder wall bulge out and piston crown flex. Then you have to make a complex trade between engine life, rpm and torque, power. Billet cranks are weaker than forged so have to be made from expensive higher grade material to compensate. Anything more will give trouble as bore wall is too thin to the cooling channels for high cylinder pressure that that power requires. Use a stock block then bore to 0.5mm oversize. This also comes with a two years parts and labour warranty.1st find a stock block with the drilled cooling channels though inter-bore wall equal distance in from both bore walls. water pump, low coolant thermostat, NGK spark plugs, oil filter/ housing, new uprated exhaust manifold gaskets and clamps are added along with a new genuine air/oil separator. If you take advantage of our fitting service £7495 +VAT, you not only get all the above, but also new service items i.e. Machining and relining, using 6 x new steel top hat liners and to include the pinning of the IMS shaft (helps prevent future IMS failures) and to overhaul the cylinder heads, which includes pressure testing, re facing, new stem seals and the valves re cut.Īll the above £6495+VAT, with a one year warranty (engine only). Main bearings, big end bearings, thrust bearings, piston rings, all chains and tensioners, all guides / rails, head bolts, con rod bolts, rail bolts, all seals, gaskets and new genuine Porsche oil pump. When rebuilding Porsche 911 997 3.6 and 3.8 engines the below parts are also replaced:. This is eliminated once these liners and pistons are fitted. To machine and fit steel liners with a top hat design which ensures extra durability, to include new pistons during the full engine rebuild would prevent any future issues, its a well known fact these engines suffer with the cylinders going oval causing scoring to the bores. We can offer the below service when rebuilding the engine to prevent future occurrence:. These Porsche 911 997 3.6 and 3.8 engines suffer from the cylinder bores going oval which results in the pistons scoring the nikasil plated liners ,causing a ticking noise similar to the sound of a noisy hydraulic.
Then engine is then re built with all new genuine seals and gaskets. Refaced valves are re cut and the head then leak tested. The camshafts are then checked for wear. Valve guides are then checked for wear and replaced as necessary, after this valve seats are machined. New stem seals are fitted. The Pistons are checked and rings are then changed,Ĭonnecting rods are inspected the crankshaft is then checked and polished.Īfter this the main, big end and thrust bearings are replaced.Ī new genuine the oil pump is fitted and scavenger pumps checked.Ĭylinder heads are stripped down and checked for wear, cracks and for trueness then pressure tested and the face machined. Some Porsche 911 997 3.6 and 3.8 may need new liners this would be at an extra cost. From this stage the cylinder bores are checked for wear, ovality etc. This removes all carbon deposits and debris from previous failures. The engine is stripped to bare components and put into a high pressure cylindrical wash at high temperature with cleansing chemicals Our Porsche 911 997 3.6 and 3.8 engine rebuilds include new piston rings, crank/main bearings con rod/big end bearings, hydraulics for both heads, new gaskets, seals, chains, all tensioners and all guides/rails. WHAT WE DO WHEN REBUILDING PORSCHE 911 997 3.6 and 3.8 ENGINES :. ABOVE ARE THE PARTS WE USE IN OUR PORSCHE 911 997 3.6 AND 3.8 ENGINE REBUILD.
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