Sunday, March 25, 2012

Roo Chaser Engine Project - Part 1

 After surviving 5,000 miles of abusive driving, the Roo Chaser's bottom end knock was getting more and more fierce by the moment. Remembering the E30 ordeal from last February, I was not in the mood for picking up bits of the rotating assembly on a forced walk home. Therefore, I decided to do the sensible thing and fix it before total harmonic destruction occurred. The best guess as to what was prompting the noise was wagered by a very experienced machinist in North Charleston, who swore up and down wristpin. However, I don't think any amount of experience would have guessed what was actually wrong.

As it turns out, someone apparently re-bored this 302 Cleveland .030" over and refitted it with .030" over rings but stock sized pistons! The amount of permissible piston slap was impressive - there was enough room between the piston and honed cylinder walls to fit a screwdriver. The ring gaps could even be viewed from atop the piston along with blowdown marks whether the exhaust blew between the ring gaps. Resting one's palm on the dome of the piston and shaking it back and forth would create a very audible and very familiar sounding knock.

As of right now, a new US market 351C has been purchased and will be rebuilt with flat top hypereutectic pistons and the reconditioned Aussie 2V 'quench' heads. Paired with a nasty cam and a Weiand intake manifold and Holley 650 four-barrel, I'm hoping for a solid 400hp or so. We shall see what it actually makes but truth be told - I don't care what it makes so long as it's not a knock.

4 comments:

  1. This comment has been removed by the author.

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  2. I bet you had as much compression as my Range Rover with "199,999.9" on the clock

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  3. Sounds like a good opportunity for a manual trans swap.

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  4. I'm trying so hard not to start the swap now but I need far too many parts. For now, I'm just convincing myself that some cars just belong with automatics

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