intake mainfold...................

[speedfr3ak]

my buddy has a 91 lx sedan with a stock f22a1 i was changing his timing belt what was soaked in oil but alright his intake mani has cracks around the injectors,its all cracked (hairline) cracks what would cause this ive never seen this on the f/h series motors but please what causes this ? or what could have ?> thanks in advance peace-_sp3

[GhostAccord]

Could you post pictures of the cracks?

Could they be casting flaws? Other than that. It is very hard to envision what sequence of events would have to occur in order to crack the areas around the injectors. There really isn't a hole lot of generalized pressure around those areas.

[speedfr3ak]

yea he will be stopping by today ill take a few pics its just very weird how its cracked up like it is

[Jarrett]

From the factory there's a support brace underneath the intake manifold to keep the weight of the manifold from being an issue. There's a chance that this has been removed in the past and the flange has now cracked from stress.

[civic_90_08]

Every Honda engine I've owned and worked on, the IM brace was removed...never seen one crack or brake off because of stress.

[speedfr3ak]

no pics yet guys will be soon today ive never seen this shit happen before even if brace is gone could i mean could this even possibly happen from revving to high or from it being bottle fed?? any of them 2

[Jarrett]

Why is a stock F22A1 with an oil-soaked timing belt using nitrous?

[cb7attack66]

maybe high heat,and porosity in the intake casting,or like said before,casting
defects.

[speedfr3ak]

Why is a stock F22A1 with an oil-soaked timing belt using nitrous?

was only running juice when it was healthy a stock f22 can hold a 50 shot oil soaked belts is new fuk up not old

[speedfr3ak]

[speedfr3ak]

[speedfr3ak]

finally got ya pics

ok well them brown lines are cracks like i have said wdf would cause this? thanks to alll u who will help me weird i owned lots of cars built lots of hondas but this is weird.............ghost hope u come on see what i mean i popped the hood of my hatch and guess what it has a b18c in it and the intake mani did the same now im puzzled brotha it happened to my hatch as well not a biggie there is no diff in anything they are just cracked

[GhostAccord]

I'm going to be honest here and say that I have yet to see that myself. Not sure exactly what might have caused them ether. The cracks around the runner could be caused by a constant heavy down force and vibration on the manifold. As for the cracks around the injector bung, not sure. They are attached to the intake so there shouldn't be any undo pressure lifting on them.

Do you know if this particular intake manifold was ever removed from the engine? Looks like it may have been dropped or crushed by something at one point.



Edit* Just realized the N2O factor;
Spraying cooler nitrous into a hot manifold, in a dry N2O setup, could cause some stress issues over time.....But I'm not 100%, I've never really run N2O for an extended period. Aluminum is usually a bit more forgiving to heat/cold fractures.

[speedfr3ak]

,.,,.

it was removed from car but i can assure u when i put it all back together those cracks were not there they just kinda appeared is that even a f22a1 intake mani? cause its not the same as my one laying on the workbench seems shorter?

[GhostAccord]

it was removed from car but i can assure u when i put it all back together those cracks were not there they just kinda appeared is that even a f22a1 intake mani? cause its not the same as my one laying on the workbench seems shorter?

If it is a single runner lower IM than it is more than likely an F22A1.

What number is after the PT on that runner pictured above? That will tell you want IM it is for sure.