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DSM injector question

Old 07-27-2009, 09:34 PM
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Just got some dsm 390 injectors but seem to have some damage to them. Seems to be cosmetic but not for sure...anyone have an idea

The damage is near "bottom" of injector. The is a black plastic piece that fits over the needle...seems to be just a cover but not sure...let me kno...cant load my pics but can send to email
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Old 07-27-2009, 10:09 PM
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heres a link to some on sale on ebay.....its the second one thats missing the black "cap"

1G DSM ECLIPSE TURBO 4G63 450CC INJECTORS BLUE TOP:eBay Motors (item 400063258443 end time Jul-29-09 083:57 PDT)
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Old 07-28-2009, 11:46 AM
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Those black pieces are called pintle caps.
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Old 07-28-2009, 06:46 PM
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oh ok well will damage/absence of the pintle caps make a difference in injector performance
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Old 08-01-2009, 08:04 AM
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The guy I am buying from says he has DSM 550's?

I haven't really seen alot of those and was wondering which car they came out of?
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Old 08-01-2009, 10:43 AM
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They don't. The largest stock injectors I've seen is Evo 510's. 550s are aftermarket unless he meant blue top 450s...
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Old 08-02-2009, 04:20 AM
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yea I dnt know of any stock injectors over 510...i have the 450's...still wondering if missing pintle cap affects the injectors performance
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Old 08-02-2009, 01:51 PM
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Pintle caps help flow, and atomization of fuel, so yes they matter. They won't keep you from running, but you'll end up with more unburnt fuel in your exhaust (backfires, bad mileage, slight lean condition). Pintle caps are cheap, especially for bluetops.

This may help as well:
What is the difference between the blue and black top DSM injectors? - 3SI Wiki
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Old 08-02-2009, 03:45 PM
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The pintle caps are cheap to replace by any injector cleaning shop. and there is a bigger DSM injectors ..it's the 560cc yellow top which came stock on the evo 8/9.
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Old 08-03-2009, 01:15 AM
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Originally Posted by 4G63TSleeper View Post
Those black pieces are called pintle caps.
...
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