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But can you use CNG with Turbo?[ALL/`86] posted by Erick Kobres on
Saturday, 16 May 1998, at 12:24 p.m.

Does anyone know if it's possible or practical to use CNG in a turbo vehicle? It seems like it should work as long as the CNG regulator has enough range to support negative vacuum levels. (Boost)

We have tons of CNG stations around Atlanta, and I've been itching to convert a
car to CNG, but I don't want to give up my T5 performance!

Maybe it would be best to get a used 740 turbo to play with... (I've been trying to think of an excuse.)


Re: But can you use CNG with Turbo?[ALL/`86] posted by Ed Lipe on
Tuesday, 19 May 1998, at 7:18 p.m.

CNG is used A LOT industrially. Normally, it's not CNG, just pipeline gas. There are two ways of feeding NG to a turbo-charged unit: 1, feed the fuel in before the turbo where it is compressed and mixed with the air. 2, feed the NG in after the turbo into the compressed air.
The trick is in the regulator. Normally,as in #1, engine is fed with 5" H2O water column of pressure, and the fuel pressure stays the same, but flow increases with increased power usage.
In example #2, the fuel pressure has to be equal to the boost pressure plus 5" pressure.
All the BIG BOYS do it, Caterpillar, Waukesha, Cummins, Detriot Diesel. This is not new technology, regular folks are just new to it.
ED7, '51 R25, '65 R69S, '67 1600 GT, '86 745 TD, '90 240 GL, '95 RWL


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