Curious what type of boat?.. and where are you? Lots of rain! No boat cover?..Engine was exposed to the skies?.. Sorry about this!..May not be that bad...Had a similar situation with water intrusion in engine from bad riser.. milk-shake oil and all!..All is good with that engine..Like...
Just so those interested for future reference.. seems I found the problem!.. One of the primary jets not tightened all the way down..Jeez! Allowing extra fuel in bowl at times. Go figure...re tightened both and now have no leaking from the primaries..also vacuum is back to normal as it should...
You have to be kidding? Posting for a friend.. Yea auto carbs (Pontiac,chevy,olds etc..) are different..but very similar in operation..check out the science! I've run a Quadrajet
7029223
(adjusted/slightly modified) and set-up for marine use) on a (5.7) 350 c.i. boat..it worked great!. but not...
Yes I'm proud of what I've done.. but boy do you know how to ruin a day..and hopes of help from others...Were done dubs..could have discussed our differences..but You chose to insult me..some advise..curtail your opinions to others I hope..leaves a bad taste for these forums....please don't...
Read my post.. a MAJOR vacuum disonnect from intake source should not cause a LARGE jump in rpm's ( a big jump in rpm's caused from excess air/atmosphere means engine/carb. is running way too rich)..I have 2 completed 70 GTO"s here.. to confirm..both are tuned perfectly..a large intake vac...
Just a few I've done.VERY RARE ones also.. ram air 400's or 455 HO's mostly convertibles..I did ALL the work ( INCLUDING ENGINE teardown and assembly.). no subbing out except engine machine work ( boring, valve jobs)..all by my self. with sometimes a helping hand from nephew..LOL..enjoy.. sold...
I really appreciate this info!.Had not thought of that! .I agree..Problem is that the engine has been running too rich for a while and really noticed it just a week ago..therefore my inquisitions.. Thanx a bunch Forrest
I lowered the idle, good grief...I know VERY well how NA engines operates...Properly running early v8 Qjet engine should not jump up hundreds of rpm's with a huge vac. leak and run smoothly....I have a complete restoration shop..with just about every tool imaginable.. been rebuilding classic...
Thanx Dub... but...dubs said.."Vacuum should increase with lower rpm". My Vac. source is from top of intake manifold..every Qjet I have/had is higher the rpms the higher the vac. lower rpms IS lower vac..Now ported vac. is the opposite ( used for distr. adv.. etc..). Compression all cyl. is...
Dubs283 said .."OP needs to lower idle speed and quit thinking about cars when working on a boat".. I get it! That's why I'm at your mercy.. Just to be clear.. What's the difference if running on muffs, next to my shop and engine/outdrive in "idle/neutral" and if boat is IN the lake and...
Thanx..All work is OUT of water with muffs.. The mercruiser manual says 650-700 IN GEAR (under prop load).. so I assume (out of water) 900 rpm or a little less or so OUT of gear out of water no load is close? Scenario in or out of water in neutral should be the same.. Correct?( venturies...
Thanx Bondo// and scott...the q jet carbs I usually work on for early Pontiac GTO's..(400 or 455 cid.) could run at around 6.2 psi..So I assumed this carb MAY be o/k with that?..So my next move will be to regulate it down to 5.5? I will let ya'all know!..Thanx! Forrest
Thanx! That's hilarious!.. I specialize in restoring to #1 levels 69 -72 GTO's!..Been restoring them for 26 years.. LOL.. anyway.. not sure if 6.4 fuel pressure is too high,not sure what is correct? Newer correct fuel pump installed also a while ago, Float is fine..I'll try regulating pressure...
