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Post by thumperslaw on May 12, 2013 20:13:16 GMT
Two problems with Diesel turbos when used in petrol powered applications... 1. Diesels have very narrow rpm band from idle to max output 3-4,000rpm and they aren't throttled so run WOT all the time. They must get to max airflow very quick ie just above idle so really run out of puff quick. A 2L+ car turbo might just about work with a 750 - I know a 1.9L one didn't with my 1100! 2. Diesels are relatively cold exhaust engines 5-600 deg whereas Petrol ones are 850 - 950 degrees and the turbines wheels are more fragile at these elevated temps. No harm in trying it, but the results won't be very satisfactory! Useful info that. Explains just what I can understand
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Post by nitro on May 14, 2013 11:58:46 GMT
Two problems with Diesel turbos when used in petrol powered applications... 1. Diesels have very narrow rpm band from idle to max output 3-4,000rpm and they aren't throttled so run WOT all the time. They must get to max airflow very quick ie just above idle so really run out of puff quick. A 2L+ car turbo might just about work with a 750 - I know a 1.9L one didn't with my 1100! 2. Diesels are relatively cold exhaust engines 5-600 deg whereas Petrol ones are 850 - 950 degrees and the turbines wheels are more fragile at these elevated temps. No harm in trying it, but the results won't be very satisfactory! In theory. In practis it works perfect, bevieve me. Also you keep the water ports of an watercooled turbo unconnected, so you see exhaust temps aren´t a problem on a turbo bike.
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Post by katana on May 14, 2013 17:32:14 GMT
Two problems with Diesel turbos when used in petrol powered applications... 1. Diesels have very narrow rpm band from idle to max output 3-4,000rpm and they aren't throttled so run WOT all the time. They must get to max airflow very quick ie just above idle so really run out of puff quick. A 2L+ car turbo might just about work with a 750 - I know a 1.9L one didn't with my 1100! 2. Diesels are relatively cold exhaust engines 5-600 deg whereas Petrol ones are 850 - 950 degrees and the turbines wheels are more fragile at these elevated temps. No harm in trying it, but the results won't be very satisfactory! In theory. In practis it works perfect, bevieve me. Also you keep the water ports of an watercooled turbo unconnected, so you see exhaust temps aren´t a problem on a turbo bike. I never said exhaust temps were a problem but using a turbo designed for use with diesel (commonly uses high grade steel turbine wheels) in a petrol burning environment that would normally use stainless or inconel for turbine COULD be. I've seen enough melted petrol burning turbine wheels to know nothing is safe! And BTW the water cooling does nothing for exhaust temps - it is there purely for shaft cooling and preventing oil in the bearings cooking on a hot shut down! Auto manufacturers want their engines to last 100,000 miles and not replace the turbo shafts & bearings every 20-30,000 miles cos they is cooked!
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Post by nitro on May 15, 2013 12:33:14 GMT
I think his question is answered. Temps are not that much and not for long cos turbo is in free air, so no water and inconel necessary for motorbikes
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Post by thumperslaw on May 16, 2013 12:29:16 GMT
There's alot i need to learn
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Post by nitro on May 16, 2013 15:19:21 GMT
In the old OSS was a lot of stuff to read and learn. From reading this you know anything necessary for builing a turbo bike. It´s really pitty that it seams to be impossible not to convert it in this forum...
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Post by johnr on Oct 23, 2014 22:09:11 GMT
Diesels are mostly low pressure turbos and small . They just run out of puff on a bike.. Now an with you! Always thought "why" but no longer do I need to. Off topic am thinking of turboing my k100 i know a guy with a turbo k100, the kit was made in the states by a firm called luftmeister, bike looks standard till you look close and spot the blower. its a bit of an animal by all accounts, i think his is the k100rs, problem with beemers is that the shaft drive doesnt allow you to alter the gearing, its a bit too compromised. ive pics if you are still planning this.
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Post by captain chaos on Oct 24, 2014 7:13:14 GMT
Now an with you! Always thought "why" but no longer do I need to. Off topic am thinking of turboing my k100 i know a guy with a turbo k100, the kit was made in the states by a firm called luftmeister, bike looks standard till you look close and spot the blower. its a bit of an animal by all accounts, i think his is the k100rs, problem with beemers is that the shaft drive doesnt allow you to alter the gearing, its a bit too compromised. ive pics if you are still planning this. I remember reading about Luftmeister in Streetfighters magazine some 20 years ago. PLease post some pics here.
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Post by slingy1052 on Oct 24, 2014 8:50:40 GMT
I thought the Luftmeister kits were made by RB racing. Still one of the kits they produce and quite well priced for a very well engineered, everything supplied bolt on kit. See here www.rbracing-rsr.com/bmwturbos.htm
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Post by captain chaos on Oct 24, 2014 16:47:45 GMT
been reading that link, and the story about Matt Capri / Luftmeister. If I understand it correctly, Matt is to the motorcycle world what Wayne Besanko is to the car world.
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Post by johnr on Oct 24, 2014 22:13:03 GMT
just checking that pics of a turbo k100 isnt gonna get me a ban?
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Post by captain chaos on Oct 25, 2014 6:27:38 GMT
Not a ban.
Anyway it is very on topic here since OP hijacked his own thread.
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