: interchangable

12-08-07, 05:02 PM
has anyone looked into see what exactly can be intercanged from the 3.6vvt engine to the 3.2L engine ? i want to see if at least cams can be swapped. Asked about the heads awhile back , and got a no , but what about the internals from a 3.6vvt to a 3.2L bare head? anybody got any info?

12-10-07, 07:26 AM
Sorry but the fact is that the engines have nothing in common. I own a Catera which uses the 3.0 (L87) from which the 3.2 (LA3) was developed. We have asked ourselves the same question. We can swap ours for the 3.2 but since the 3.6 is wider it won't fit in our engine bay. We looked at mixing our block and the 3.6 heads but no joy.

The 3.6 (LY7) is a 60 24-valve design with aluminum block and heads with variable cam phasing on both intake and exhaust valves.

The 3.2 (LA3) is 54 24-valve (non-variable) design with an iron block and aluminum heads.


Po Pimp
12-14-07, 08:47 PM
I don't think he ment an engine swap rather the internals. I have looked and have not found any real specific information for the 3.6 VVT. At least not that specific.

12-15-07, 02:07 PM
I thought that's what I said? In a nutshell, the engines have nothing in common. They may have been designed by the same team but have little else in common. That includes the engine management systems.

GM 54-Degree V6 engine
From Wikipedia, the free encyclopedia

General Motors' Opel division in Europe designed a compact V6 engine with an odd 54 vee angle. It was an iron block/aluminum head DOHC design with 4 valves per cylinder. All 54 engines are assembled at Ellesmere Port in England.

This engine was used in the American versions of these models as well. The engine was reworked substantially between the 3.0 L L81 and 3.2 L LA3, but the bore centers and deck height were retained. In its 3.0 L form, this engine has a notable history for recalls of all units installed in U.S. Cadillac Cateras due to problems with timing belt tensioner bearing failures, which could cause catatrophic damage to the engine with its interference design.

The L81 was used longitudinally in the Opel Omega, Cadillac Catera and transversely in the Saturn L-Series and Saab 9000. Bore and stroke were 86 mm (3.38 in) 85 mm (3.35 in), for 2962 cc (180.75 in) displacement. with 10:1 compression, the engine produced up to 210 hp (155 kW) and (270 Nm).

Saab's turbocharged version for Saab 9-5 (the X30) produced 200 hp (149 kW) at 5000 RPM and 229 ftlbff (310 Nm) at 2500-4000 RPM. Saab equipped the engine with special version of Saab Direct Ignition.

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GM High Feature engine
From Wikipedia, the free encyclopedia

The 3600 LY7 (and derivative LP1) are members of General Motors' new High Feature (or HFV6) engine family of modern DOHC V6s. This new family of engines was introduced in 2004 with the Cadillac CTS. Holden sells the HFV6 under the name Alloytec. The block was designed to be expandable from 2.8 L to 4.0 L.

It is a 60 24-valve design with aluminum block and heads and Sequential Electronic Fuel Injection. Most versions feature continuously-variable cam phasing on both intake and exhaust valves and electronic throttle control. Other features include piston oil-jet capability, forged crankshaft and connecting rods, a variable intake manifold, twin knock control sensors and coil-on-plug ignition. It was developed by the same international team responsible for the Ecotec, including the Opel engineers responsible for the 54 V6, with involvement with design and development engineering from Ricardo, Inc.

The 3.6 L (3564 cc) LY7 version was introduced in the 2004 Cadillac CTS sedan. It has a 10.2:1 compression ratio and produces 255 hp (190 kW) at 6200 rpm and 252 ftlbf (342 Nm) at 3100 rpm. The bore is 3.70 in (94.0 mm) and the stroke is 3.37 in (85.6 mm). In some applications, including the Buick LaCrosse and Holden Commodore, the LY7 has an output of 235 to 262 hp (175 to 195 kW) and 225 to 251 ftlbf (305 to 340 Nm) depending on the vehicle induction and exhaust system designs. Selected models also include variable intake. The engine weighs 370 lb as installed.

12-28-07, 07:29 PM
Just wondering, what was the advantage of the 54 degrees used on the Catera engine? Is it just to make the engine more compact, or was there supposed to be an advantage in smoothness or something? :hmm:

'97 Forrest Green Catera.

01-01-08, 02:58 PM
Just a compact size. DOHC engines are wider at the heads than OHV engines due to the camshafts being at the top of the heads instead of buried in the block. GM/Opel/Vauxhall also used this L81 in FWD cars where compactness is crucial.