chevy tbi 454 compression test 180psi|454 compression test : exporters I recently did a compression test, both dry and wet, and all cylinders were about 135-145 except cylinder #1 which reads 160 psi. I have my records from doing a compression . WEBZACA GRAVA VÍDEO AGRADECENDO AOS INTERNAUTAS O PRIMEIRO LUGAR EM AUDIÊNCIA DO 'PORTAL DO ZACARIAS' NO AMAZONAS E NA REGIÃO NORTE. 'PORTAL DO ZACARIAS' TAMBÉM JÁ É O DÉCIMO PORTAL MAIS ACESSADO DO BRASIL. OS DADOS SÃO DO IVC . Menina de 10 anos é sacrificada em ritual para .
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got a few things going on with the motor so I thought I'd run a quickie compression test on all 8 cylinders. Here's what I got. #1 180 psi. #3 180 psi. #5 180 psi. #7 . got a few things going on with the motor so I thought I'd run a quickie compression test on all 8 cylinders. Here's what I got. #1 180 psi. #3 180 psi. #5 180 psi. #7 .
I recently did a compression test, both dry and wet, and all cylinders were about 135-145 except cylinder #1 which reads 160 psi. I have my records from doing a compression . Valve seals "seal" the end of the valbe stem from the oil in the valve cover area. They don't seal against the compression of the engine. The head of the valve does that and . The stock compression for a 454 with 781 heads and flattops is around 7.75:1 cr. Then the bigger cam with the later intake valve closing point will reduce cylinder pressure even .
Compression test showed 130-150 across all. I changed the plugs and one or two had a lot of ash deposits looks like from burnt oil. Then got new plugs checked after 3 months . Your cranking compression should be closer to 160 psi, have the throttle open next time, but as stated you have little variance. The 3702 is a crappy cam and you will not be .
The spec for 454 compression is lower than for small block 6 and cylinder engines. Around 130-140 for a healthy 454 would be very good. Small blocks spec around 170-180. The .
Hi all, 92 LC: 3F-E engine recently ran compression test (I did it myself, first one), and all cylinders ran max pressure of 180 to 185 psi. First compression stroke was always around 120 on the gauge, then 150 on the second, then 180psi every additional compression stroke (on my gauge which did not have the pressure relieved). -GM heads casting 3904390-Keith Black Pistons KB202 .040 . Pull all the plugs and do a cranking compression test (look on you-tube for details). I think hi-test pump gas the limit is about 180-190 PSI. . All I know is my 454 had a 12.5 :1 compression ratio and detonated badly even with the best and highest octane pump fuel available (Shell .Stock TBI 454 makes 230hp and 380tq so stock fuel pump is maxed out right off and a typical 454 will run better with a fuel pump upgrade even with stock chip. . The 2 KEY problems with a 454 engine is GM built it with a terrible low 7.75:1 compression ratio which is not only not good for performance but also causes poor fuel efficiency so if .
Fails compression test — then likely a new engine. Otherwise, keep the current engine and just do the required maintenance on it (replace leaking seals, gaskets, etc.). If the latter, it would save me k that I can use to buy other things for the truck. It’s been a long time since I did a compression test on any engine.
I recently installed a new fuel pump in my 87 k5 with a swapped in 454 TBI thinking it would hepl with my fuel pressure leak down. After the vehicle is shut off is the pressure suppose to hold steady at the rated pressure? when i turn the truck off the pressure drops rapidly to 3 psi after stalling around 6psi. i have been trying to solve a mid-high end sag issue at WOT There is the Holley 670 TBI and there is the stock GM 454 TBI unit found on all 454 big block TBI trucks. Both have 2” bores as compared to the stock 1 11/16” bores. . The only disadvantages are the lack of EGR (Vettes used external plumbing) and aluminum loses compression in comparison to iron; that's why they used 58cc chambers on a 350 . My most recent test with a nice OTC compression gauge that I've validated through parallel measurement against a Grade A Valley gauge from Northern Tool yielded the following results: No. 1 180 psi No. 3 185 No. 5 190 No. 7 168 No. 2 194 No. 4 200 No. 6 198 No. 8 192 This puts No. 7 16 percent below the high, which was No. 4. kahl_454 Discussion starter . Hi, my cylinder 7 isn't firing on a 305 so I ran a compression test and got about 120psi on that cylinder and a good cylinder was 150psi, is this a big variance and does it mean the cylinder 7 is somehow stuffed? The lead, dizzy, plug and spark are all fine and when I pull the rocker cover and turn the crank the .
I am looking to find out what the fuel pressure specifications are for a Sequential Port Fuel Injected 454. For my vehicle I took the following Data and trying to judge whether this is within specifications. At Key On - Surges to 58 psi and then drops back to 52 psi . I did one last test tonight. I removed the fuel filter and put a fuel .
a compression test wont confirm engine work that needs to be done. the size of the camshaft in relation to the compression ratio of the engine could very well create 110 psi in an otherwise healthy engine, with the only problem is that the cam is entirely too big. what you need is a cylinder leakdown test to tell you exactly what is wrong with it. 1993 Mercruiser 7.4L with 135hrs on it. Did a compression test to see what was what, and was surprised to find lowest at 110psi and the highest at 125psi with most at 115-120. These seem pretty low to me, but maybe that is normal for this engine. I was expecting to see around 150 or so. The only way to measure fuel pressure is with a TBI fuel pressure test kit. You might be able to rent one/loan a tool from the chain parts store. . A low compression 454 is gonna suck the fuel. . Note this,, Whenever you put a thermostat In an engine you must buy the type that when it breaks it breaks= OPEN ! not closed .. This may a count .
So lets wrap this up. GM claims the Heavy Duty LO5-K has a compression ratio of 8.75 to 1. They claim the Light Duty LO5-K and the passenger/police version have 9.5 to 1. I've always found Chevy's compression ratio claims to be optimistic by .2 to .5 to 1. Ok my brain is tired after this exercise. Bogie
How To Do An Engine Compression Test. Solving a hard to find Misfire Condition. P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308. Testing the GM 4.3L, 5 .
The TBI fuel pressure specification for small block Chevy’s is 9 – 13 PSI with the truck running. Here are some web sites showing fuel pressure test equipment. The first tool gets installed where the fuel filter goes. Most people use the tool in the third site next to the TBI unit. I performed a compression test on my 454. I purchased my Chevelle 6 years ago with a nice running 454 in it. From the information that I gathered from the stampings, It's a 1986 2 bolt main HI Perf on the block out of a 1986 K20 with standard transmission. The oil pressure seemed low 10 at idle 40 cold start. 7/28/2012 Performed Compression and Leakdown test, took pictures of each spark plug (all looked pretty similar light tan) . 6154 gm. *tbi says 250 on body, 168z91 on top of body, 139 below regulator/109 on top of regulator . Vans, Suburbans, Blazers, Tahoes » 94 7.4L 454 tbi weak above 2000rpm FusionBB™ Version 2.1 ©2003-2006 .
You'll get one of two results: 1) The compression value will go up (from the one you recorded before). 2) The compression value will stay the same. Let's interpret your test results: CASE 1: The compression value shot up.This tells you that the piston compression rings are worn out and thus the problem is in the bottom end (block) of the engine in your GM 4.3L, 5.0L, or 5.7L . Im Helping a friend put in an engine and harness from a 95 454 into a 98 K 2500 truck. In the tank is a new fuel pump and sending unit. . '87 GM Truck Modifications. Tech Discussion . . 1995 454 tbi fuel pump & pressure recommendations. Thread starter squaredeal91; Start date Oct 31, 2023; Disclaimer: Links on this page pointing to Amazon . Chevy Forums FREE technical assistance for your restoration and repair. Model specific subject matter experts, classified ads and more. . 454 TBI engine out of '94 Suburban 3/4 ton. Compression test: 1 135 2 135 3 125 4 130 5 110 6 130 7 130 . Main Index » Forum Index » Automotive General » Performance and other Engine/Transmission .
Hello, my name's Ryan, new user with my first square body. 89' V3500 TBI 454, TH400. 66k on the odometer. Been on quite the gremlin hunt going on a month. When I first got the truck, it had been sitting for 7-8 years. Engine is a 350 bored .060 with stock tbi heads, edelbrock torker intake, edelbrock 750, edelbrock shorty headers, .488/.488 lift cam, and true dual flowmasters. Thanks . did a compression test on my chevy 350 cyl# pressure 1 155 3 152 5 143 7 145 2 50 4 42 6 35 8 49 What could be wrong. I went back and check driver side to see if I messed on . 454 compression ratio questions (please help!) . Keep in mind that the GM 454HO crate engines get 425 horsepower out of 8.75:1 compression. .. For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory., released (intentionally or negligently) into the world in 2019 (VOWL .
compression test results
454 Compression Test vs Leak Down Test? The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove these . 88' Chevy V30 3+3 4x4 Dually 454 TBI/NV4500/NP205 08-16-2014, 11:34 PM #19: savatreatabvr. Registered User . Join Date: Oct 2011. Location: phoenix, az. Posts: 508 .
Hello all, Recently bought a 91 crewcab square with a 454 TBI with a 4l80e behind it, after vehicle has been shut off, after more then 30 seconds it won't restart, found injectors to not be pulsing on startup/spraying fuel. If vehicle is started with starting fluid it will stumble to life. I have an 89 chevy with 200,000 miles on the engine. The last 20,000 or so it has gotten slower and slower. I did a compression test to see if it was the valves or the the pistons. Tests indicated that all pistons had pretty close to equal PSI. My question is what the PSI should be for a healthy running 350. I conducted a leak down test today after warming the engine. The test pressure was 80 psi. Here are the most recent compression test results from the original post with the leak down percentages from today's testing. No. 1 180 psi, 8 percent No. 3 185 psi, 4 percent No. 5 190 psi, 6 percent No. 7 168 psi, 13 percent No. 2 194 psi, 5 percent
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chevy tbi 454 compression test 180psi|454 compression test