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Old 05-17-2013, 10:39 PM
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engine diaper on 10 second Model A

After years of trying, I finally got my Tudor A streetrod to run in the high 10s in the quarter. The bad news is that now, NHRA requires any car running under 11.00 to run an engine diaper. For reasons of over heating, it is not practical to run an engine diaper on a street rod. And "Yes", I could slow the A down, most easily by swapping the upper pulley on the 4/71 blower, but after all these years, literally decades, of getting a street ride into the 10s, I do not want to go there. Any ideas out there on making an engine diaper work on a street rod ? It simply is too much fun to have a grocery getter that will run high 10s in the quarter, then drive home from the track on street tires.

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Old 05-18-2013, 11:54 AM
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In the NHRA rulebook, under General Regulations, 1:8 refers to engine containment. It states that you can use a belly pan with a flameproof absorbant pad installed. I use small binder clips to hold the pad in place.

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Old 05-18-2013, 01:57 PM
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As Bill says, you can use a sheet-metal tray with 2" high sides, sort of like a pan you might use on the garage floor to catch drips.
"..... may use a belly pan in lieu of a
device attached to the engine. The belly pan must extend from
framerail to framerail and extend forward of the harmonic balancer
and rearward to rear engine plate and must incorporate a minimum
2-inch-high lip on all sides. A nonflammable, oil-absorbent liner
mandatory inside of retention device. Minimum number of slots or holes in the walls to clear frame, steering, or lines permitted."

Oil Absorbent Mats: Find Oil-Only Absorbing Pig Mat & Pads | New Pig

I would bend up a tray at a sheet metal shop after measuring the size needed. Much trial fitting will be necessary to determine where straps and such will be welded on to mount the tray to existing points on the car. I'd use oil-absorbent pig mat in the tray, covered with a piece of expanded metal to prevent the pig mat blowing out of the tray at speed. Secure the expanded metal to the tray.
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Old 06-10-2013, 01:26 PM
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Great idea, Im in the middle of reworking a similar car, except a Coupe, and will be in the 10-sec range also if all goes right
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