Roger K Posted February 11, 2021 Report Posted February 11, 2021 I see some of the suppliers offer a yellow plastic fan, listed as 'OEM' for GT6. My non-roto Mk3 has a fan with rounded blade ends - the ones for sale have square. Did they change, and is the rounded one available anywhere? Thanks, Roger
NonMember Posted February 11, 2021 Report Posted February 11, 2021 I think my late roto Mk3 also has rounded fan blade ends but I'm not going out to the garage right now to check.
Roger K Posted February 11, 2021 Author Report Posted February 11, 2021 Given that the temperature where you are can't be much different to here, I don't blame you.
Pete Lewis Posted February 12, 2021 Report Posted February 12, 2021 think the rounded ends has more blades similar to whats used on later cars and early 2000 saloon canley parts list shows both quite clearly https://www.canleyclassics.com/?catalogue=triumph-gt6-mkiii&diagram=triumph-gt6-mkiii-fan Pete
Nigel Clark Posted February 12, 2021 Report Posted February 12, 2021 I've seen both plastic fan types on Mk3 GT6, rounded blade tips and straight. Nigel
Roger K Posted February 12, 2021 Author Report Posted February 12, 2021 37 minutes ago, Pete Lewis said: think the rounded ends has more blades similar to whats used on later cars and early 2000 saloon canley parts list shows both quite clearly https://www.canleyclassics.com/?catalogue=triumph-gt6-mkiii&diagram=triumph-gt6-mkiii-fan Pete Good find Pete, but I think the one with more blades is the viscous type, at the top of Canley's pic. My car is a late MkIII and has the one on the left, 311868. The only one I can find for sale is the earlier type, shown on the right, 308353, which is marked as USA and Sweden only. The round-blade looks like 7 blades, the square one has 8.
Ian Foster Posted February 12, 2021 Report Posted February 12, 2021 Roger I did a bit of research on this a few years back and concluded the round tipped Mk3 fan was NLA. I'm not sure why Triumph changed from the square to the round flavour, but I surmise that it might be more efficient and therefore less power hungry. If yours is damaged your best bet is probably a good used one. I've gone electric but still have my original yellow square job available to fit should I so decide. Ian F
Pete Lewis Posted February 12, 2021 Report Posted February 12, 2021 rimmers stock both 8 and 7 bladed lots of £££s for GT6 https://rimmerbros.com/Item--i-GRID007992 Pete
johny Posted February 12, 2021 Report Posted February 12, 2021 cant see it there Pete and I think its officially not produced anywhere as not needed because of the availability of the 8 blade item...
Roger K Posted February 12, 2021 Author Report Posted February 12, 2021 Found one! Sit down before looking at the price..... https://www.sportsandclassics.com/parts/oem-original-parts/triumph-original-parts/triumph-tr6-70-72-7-blade-yellow-fan-311868-nos/ 1
Pete Lewis Posted February 12, 2021 Report Posted February 12, 2021 rimmers superceed with 8 bladed yellow https://rimmerbros.com/Item--i-308353 £85 canley classics 308353 at https://www.canleyclassics.com/?canvas=home @ £49 +Vat whats not to like ???? who sees the fan to know if its round or square blades anyway ???? Pete
dougbgt6 Posted February 12, 2021 Report Posted February 12, 2021 Mine is 7 blades, plastic, rounded ends and yellow. Has to be yellow! Doug
Guest Posted February 12, 2021 Report Posted February 12, 2021 Just out of interest and for something different: Triumph TR6 Red 13 Blade Cooling Fan and Hub | eBay I do not know if the TR6 and GT6 have the same mounting & will fit.........in addition I do not know if 13 blades provide better cooling...... could this fan design be better ?? Regards. Richard.
Colin Lindsay Posted February 12, 2021 Report Posted February 12, 2021 That one looks very like this viscous Spitfire version: If it's not a straight fit to the GT6 pulley a suitable centre mounting would be relatively easy to make.
Pete Lewis Posted February 12, 2021 Report Posted February 12, 2021 Richard on that boss theres no space for/ doesnt have the rubber damping grommets/bushes looks a direct 'hard; fit it I thought unusual for a 6 pot dont know ?? bush kits are listed for one of the 3 fans all a bit mix and match on TR6 by the look of it https://rimmerbros.com/Item--i-GRID600025 Pete
Guest Posted February 12, 2021 Report Posted February 12, 2021 Thanks Colin and Pete. In your opinion, would the extra blades improve cooling........... putting aside the issue of fitting ?? Regards. Richard.
Roger K Posted February 12, 2021 Author Report Posted February 12, 2021 I doubt it would make much difference. I don't think it would be particularly easy to fit a viscous coupled fan to a fixed water pump. I'm pretty sure GT6s never had the viscous coupling. The usual reason for straight edges or round is as an attempt to reduce noise.
Colin Lindsay Posted February 12, 2021 Report Posted February 12, 2021 13 minutes ago, Roger K said: I doubt it would make much difference. I don't think it would be particularly easy to fit a viscous coupled fan to a fixed water pump. I'm pretty sure GT6s never had the viscous coupling. They didn't, but what I meant was to attach the fan alone to a GT6 pump with a fabricated mounting, not the whole viscous setup. The original GT6 fan was a 6-bladed metal construction that would definitely chew fingers off, so the plastic version on later models is an improvement on that. I think there's a cooling limit, so more blades don't mean more cooling, just - possibly - more air forced through at lower revs. My Herald has a twin-blade fan on a wide radiator, but later cars had the four-bladed fan on a narrow radiator, which seemed to do the job just as well. Best option is to keep the radiator clean and running well, maybe even uprate the original core to a modern version, then the number of fan blades isn't really as critical.
Roger K Posted February 12, 2021 Author Report Posted February 12, 2021 It seems odd to me that there's no shrouding as such - unless I'm missing a lot of parts! Moderns, and aftermarket kits, have close-fitting shrouds around the fan blades themselves which force all air coming through the rad to go into the fan, which improves efficiency no end. I've got the cardboard 'funnel' in front, which probably helps a bit...
Guest Posted February 12, 2021 Report Posted February 12, 2021 20 minutes ago, Roger K said: The usual reason for straight edges or round is as an attempt to reduce noise. Yes indeed. Curved fan edges are quieter than straight edge BUT, straight edge fan blades are able to move a greater volume of air as a result on the design.
dougbgt6 Posted February 12, 2021 Report Posted February 12, 2021 44 minutes ago, Roger K said: I've got the cardboard 'funnel' in front, which probably helps a bit... I f your funnel is anything like mine was it's sagging in the middle? Replacing it with the metal version made a considerable difference in cooling, that and dropping the number plate to avoid blocking the grill inlet. Doug
Pete Lewis Posted February 12, 2021 Report Posted February 12, 2021 I guess there is a triumf drawing with the fan spec detailed in RPM and CFM etc who's got it ???? Pete
Gully Posted February 12, 2021 Report Posted February 12, 2021 Aren't we all Triumph fans?! Sorry, I'll get back to my work spreadsheet... Gully
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