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Anon Deleted Posts : Location : Status : Offline |
Odd jet sizing for an 1800 - no wonder it wasn't happy Been having trouble getting my Trailblaze to run right, particularly on steady part throttle - it tends to surge, especially in first and second, but the idle is spot on and and using the accelerator pump gives it a good boost of power.I rebuilt a spare Zenith 36IV (25mm choke) with the jets from the original carb that came with the van, but didn't check the sizing - anyway, long story short, I checked them today and the main is a 65 (should be 85), with a 110 compensator jet (should be 115)? Idle is correct at 45. I assume this small compensator jet in particular could be the source of my issues. Where is a good place to source new jets for the 1800? Also, the carb is different from my other zeniths - economy device is a three piece unit with a screw in jet underneath, and the beak is smaller than on my other 36IVs with slightly different jet positions - is this normal for the 1800? 
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 Mon 26 Mar 2012 @ 22:59
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Anon Deleted Posts : Location : Status : Offline |
hmmm,so what SHOULDmy jet and chock tube sizes be. getting some conflicting info from t'internet. |
Tue 27 Mar 2012 @ 14:50
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Anon Deleted Posts : Location : Status : Offline |
Hi PhilB,According to haynes,your sizes are correct-standard 25mm-choke 85mm-main 115mm-compensating 45mm-idle pump jet-all-55 needle valve-all-1.75mm needle valve washer-all-2mm it does mention a code 636- 1800---choke--27mm ---------------------- |
Tue 27 Mar 2012 @ 14:59
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Anon Deleted Posts : Location : Status : Offline |
Thanks Alex. I should have been a bit clearer. The jets that I have are 65 and 110,rather than the standard in haynes. I wonder,could the van have been used at altitude and thus required smaller jets? Anyway, I need to source the correct ones from somewhere... |
Tue 27 Mar 2012 @ 15:09
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Anon Deleted Posts : Location : Status : Offline |
Emulsion block on the right is what I'm used to seeing on CFs. Tech Data for Zenith now uploaded in Howto section. ---------------------- |
Tue 27 Mar 2012 @ 16:19
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Anon Deleted Posts : Location : Status : Offline |
Cheers Phil. Both my 2.0 HC and the Zenith I picked up off ebay had the emulsion tube on the left. hmmm. Well, at least I know what I'm aiming for now. The original carb off the 1.8 had a duff idle needle and a jammed accelerator pump, so I've sourced a NOS unit which is apparently for a 1.8. Don't recognise the part number though - 3876. Linkages look right and it's the later variant so worth a punt. |
Tue 27 Mar 2012 @ 20:44
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Anon Deleted Posts : Location : Status : Offline |
Ah, a 2-litre ... 1600cc & 2000cc Zenith tech data added - 1969-72, 1972-on 
Had a peep at early carburettor pics as well: left hand one is early, right hand one is late. The two normally don't mix, something to do with different top cover venting (change to plastic elbow identifies). ---------------------- |
Tue 27 Mar 2012 @ 22:25
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