Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Porsche Boxster S L33

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Old 03-01-2015, 09:38 PM
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Default Porsche Boxster S L33

Hey guys, I'm just starting to work on a Boxster V8 conversion and I thought I'd share my build with you. My name is Vlad, and I'm a 27 year old Mechanical EIT from Toronto, Canada. This is my first Porsche and first car build, so please bear with me.

PS you can also follow this on my blog at rollingshell.com or instagram at PorscheLSX

Old 03-01-2015, 10:26 PM
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Check in on the Porsche conversion page, there are a number of us working on 996 conversions. I will be tuned in to see how yours is coming along!!!
Old 03-02-2015, 01:36 PM
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The first thing that I bought was an engine. Jalopnik had a gret guide on how to build an LS engine on a budget, so I decided to go that route. I first picked up an LM4 aluminum block from a 2004 Envoy XL. The guy at the scrap yard said that it was tested and had great compression, so I couldn't pass it up for the price.



I spent the following week tearing it apart and cleaning. The engine looked good, but it did have some rust. I managed to snap a couple of exhaust manifold bolts which was a major pain (you can see more pics on the blog)



I got a whole bunch of NPT fittings from my dad and put together a leakdown tester to see how good the engine internals were. To my surprise it pretty much had 0 compression. You could hear the air rushing out pretty much everywhere. At this point I decided to take off the heads and clean up the valves to see if that would solve the problem.

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Old 03-02-2015, 02:30 PM
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How much did you pay for the roller?
Old 03-02-2015, 03:19 PM
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Originally Posted by hayabusa
How much did you pay for the roller?
4 grand CAD, so that's $3200 USD
Old 03-02-2015, 05:24 PM
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Good price
Old 03-02-2015, 05:26 PM
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Originally Posted by hayabusa
Good price
I had to rent a truck/trailer and drive about 600 miles, so in the end it was closer to $4500 CAD. Still good price tho, especially for Canada
Old 03-03-2015, 11:29 PM
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I took the heads apart and as expected the valve faces and seats were pretty gunked up and pitted, not to mention all the crap and leaves that were in the cylinders. Since I didn’t have money to get the valves recut, I decided to lap them. Most people are against this, but this is a budget build, so screw it. I used a hand drill and a little piece of air hose to do the job. Again, most people advise against this, but there was way too much pitting to do it by hand.
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Old 03-03-2015, 11:30 PM
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Here are some pictures of my car. It took me a while to find a good one actually. I posted several wanted posts on Kijiji, and signed up for notifications on eBay and every major city on Craigslist. A few things came up here and there in the States, but nothing really worth the drive and hassle of importing it to Canada. After a couple of months of searching I found this best. Had to drive to Ottawa to pick it up, but it was worth it. It looks pretty bare in the pics, but thats actually how I wanted it. I'm pretty much trying to make a street legal track car.



Old 03-04-2015, 02:41 AM
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That's a bummer about the cylinder heads. But the car looks great. I screamin Ls engine behind the seats will be awesome.
Old 03-04-2015, 06:13 AM
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martsink ,,, perfect engine for your build ,, light and powerfull ,, what gearbox do you plan on useing ,,adapter ?
Old 03-04-2015, 09:08 AM
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Originally Posted by ijimmy
martsink ,,, perfect engine for your build ,, light and powerfull ,, what gearbox do you plan on useing ,,adapter ?
I will be using the stock 6 speed Boxster S tranny. Kennedy engineering makes an adapter plate for these
Old 03-04-2015, 10:36 AM
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So does it run the Ls clutch with that adaptor? Or is it custom stuff?
Old 03-04-2015, 10:56 AM
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I also make the adapter for this conversion. Uses a Porsche clutch as the LS clutch is too big to fit in the bellhousing of the transmission. PM me for details.
Old 03-04-2015, 02:05 PM
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How much power can the transaxle handle?
Old 03-04-2015, 02:16 PM
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Originally Posted by gnx7
How much power can the transaxle handle?
I think the tranny can handle quite a bit of power, but the axles seem to be the weakest point. There are cars out there with LS7s that seem to be running with no problems.
Old 03-04-2015, 06:12 PM
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wow, must be tight fit. i will follow your built for shure.
Old 03-05-2015, 06:32 PM
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in for this one!
Old 03-06-2015, 01:02 AM
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When you get done we should race. I'd love to know whats faster a 5.3 996 or a 5.3 boxter. Both are cool! Awesome swap good luck!
Old 03-06-2015, 06:43 AM
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Very cool project, subscribed!


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