1969 pontiac 400 compression test|400 pontiac compression ratio : bulk Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.83 :1. V/P (Volume to Pressure Index) is 178 That jives very closely .
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pontiac 400 compression test. question for all the pontiac guys: I have a pontiac 400 (406) KRE 74cc alum heads, mild crower cam. Pistons are not the best just TRW stock .
pontiac 400 compression test. question for all the pontiac guys: I have a pontiac . A .030" over 400 with 6cc valve reliefs in the pistons, .010" block deck height, a .045" compressed gasket thickness, and 72 cc heads will produce about 10.1:1 compression. I recently did a compression test on my 69 that I just bought, it has a 71 400 small block and the numbers that I got averaged out at about 230 psi. I have have a few people tell . Today I pulled the plugs one by one and performed a cold, dry compression test. Throttle was all the way open, but I left air cleaner on. All cylinders except Number 1 came .
Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.83 :1. V/P (Volume to Pressure Index) is 178 That jives very closely . Hi folks, I am working on my 1976 Firebird Formula 400 - 4BBL and just completed the cylinder compression tests today. I had right around 120 PSI on all 8 cylinders (with .
pontiac 400 compression test
Here is the Wallace Compression Calculator which can be of help to you in figuring out the numbers to get your compression between 9.0-9.5 for iron heads & 91 octane . We just finished up the dyno testing of a mildly-built Pontiac 400, and the results follow. The engine was a 1976 Firebird 400 – the mighty 185-horse with an actual compression ratio of 7.1:1. am just building a 400 pont. street motor for a customer. the static compression ratio is 10.4 to 1 and when i do the calcultions on it with the cam timing involved etc. the .
The first year Pontiac produced the 400 V8 engine was 1967. Pontiac 1960-1969 / Pontiac 1970-1979; . Max Brake Horsepower: 330@ 4800rpm Max Torque: 430 @ 3000 rpm Stroke: 3.75 Bore: 4.1212 Compression: 10.5 Firing Order: 18436572. 1967-1970 . Compression test needs to be done warm engine and all spark plugs removed. Spin engine over through 5 compression cycles before doing test. . Wallace Racing's Pontiac Engine Search All 400's had a 4.120" bore, 3.75" stroke, 6.625" rods, 3" mains, & 2.25" rod big end. The pistons had 4 valve reliefs, .980" pins, and a compression distance(pin . Engine is a Pontiac 400 from 1977 with W72 option. . The late 70s pontiac engines had low compression from the factory, so the cheap 8-eyebrow pistons reduce it even more. The W72 option at least had decent 6X-4 heads and the stronger block casting. The 93 CC heads will work well with flattops like a TRW forging or similar piston with minimal . In this guide, we cover the Pontiac 400 engine. Learn about Pontiac 6.6L V8 specs, performance upgrades and common problems. . In 1969 and 1970, the Ram Air III and Ram Air IV 400 V8s were released. . which can be .
Looking on Franks Pontiac website here in SoCal and all the Big valve heads go for around 0 or more but found two sets 1.94/1.66 heads with smaller chambers for 0-0 is it worth the extra $ for the big valve head for a almost stock engine?
We recently disassembled an excellent bone stock 1975 Pontiac 400 from a Trans-Am. Actual compression ratio was measured at 7.8:1. Cam was a Pontiac 066 and measured in at 197/206 - 112, as specs call for. Even with the original stretched timing chain, cam was found positioned at a 107 degree intake lobe centerline, also as specs call for. The calendar on the wall shows it’s 6/6—close enough to Pontiac’s iconic “6.6 Liter” badging on its Trans Am shaker hood scoops to have us thinking about everything Pontiac 400. To celebrate the workhorse Pontiac V-8 (sorry Olds 403, today’s not your day) we’ll highlight some of our favorite applications of the staple muscle car engine. Pricing starts at 0. Starter. A stock Pontiac starter is designed to turn over a production-type Pontiac V-8 that operates on pump gas and uses original equipment. Significantly increasing the compression ratio, such as that required for competition engines, raises the amount of cylinder pressure the starter must work against when attempting . The engine was a 1976 Firebird 400 – the mighty 185-horse with an actual compression ratio of 7.1:1. I basically converted it into a 1967 335-horse (gross rating) GTO configuration with the “670” closed chamber, large-valve heads, which ended up producing an actual compression ratio of 10.08:1 with flat-top pistons and the stock deck height.
The 400-cid Pontiac V8 that bowed in 1967 Pontiacs was a bored-out version of the 389 and a new 428 was a bored-out 421. The extra cubes were added to mask the fact that Tri-Power options were no longer offered. The top 400-cid V8 was a four-barrel edition for the GTO that had the same 360-hp rating as the previous year’s 389 Tri-Power version.The Pontiac V8 engine is a family of overhead valve 90° V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. The engines feature a cast-iron block and head and two valves per cylinder. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to .
That's pretty high. I would guess they have a flat top piston and probably a smaller chamber head like 64cc or so. Compression jumps quick with the larger bore/stroke on the 400. Cranking compression has a lot to do with cam timing also, so a . I put together the specs on the factory-installed GTO camshafts for the 389/400/455. They are often referenced by their last part number digits, ie "066," "067," "068," etc. . if you did a compression test on either of these two 9:1 static compression engines, the engine with no overlap (or even negative overlap) would probably have about 140 . Check out this 1969 Firebird "Little Big Chief" Chassis Dyno Test - High Performance Pontiac Magazine. . (plus 0 for dyno testing) to build this 350 that puts 342 hp to the flywheel and 252 . Get a good three angle valve job on a pair of 1967-1970 GTO/Firebird 400 heads with 10.5:1 compression ratio and install a free flowing exhaust system. Use a good high performance hydraulic roller camshaft with a 3000 stall converter and/or 3.90 :1 rear end gears. . The best running Pontiac I had was a 1969 Firebird 400 with a 4-speed. No air .
400 engine/compression reading questions Pontiac - Street . Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > 400 engine/compression reading questions Reply Thread Tools: . dry compression test. Throttle was all the way open, but I left air cleaner on. All cylinders except Number 1 came back at 130 .
i did the figures with a 72cc head and .016 in the hole and a flat top with 5cc valve notches a .039 gasket and got 9.8. i looked at .027 cometics to get 10.2. i haven't took the engine apart yet to see the real measurements. but this . Pontiac replaced the broken gears with a 4.33:1 4-pinion Saf-T-Track. Thanks to the late Monk King Pontiac dealership in Denton Texas. I had to re-learn how to drive the Pontiac 400 like it was a 327 Chevrolet and launch at 4,000 RPM and shift at 6,000 RPM with a Scheiffer pressure-plate and a bonded and riveted clutch disc.
The Firebird 400 package featured a 330-bhp 400-cid WS6 V-8 with 10.75:1 compression and non-functional hood scoops (1-7 – 4-speed engines were hotter). The Firebird 400 Ram Air III featured the 330-bhp 400-cid V-8 with de-clutching . Static compression ratio of 10.66:1. Effective stroke is 3.04 inches. Your dynamic compression ratio is 7.77:1 . Your dynamic cranking pressure is 153.06 PSI. Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 7.77 :1. V/P (Volume to Pressure Index) is 151
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I did a compression test of my pontiac firebird YJ 350 the other day. The motor is 30 over, has over 100k and was changed over to an Edelbrock P4B intake and a Holley 750 double pumper. I know, the carb is too much for it. The test is as follows in psi: 1-155 2-155 3-145 4-147 5-145 6-150 7-160 8-150
Though the 350-hp L78 400 engine was standard in GTO’s, the L74 366-hp D-port Ram Air engine, which was later listed as the Ram Air III, was standard in the Judge. With a 10.75:1 compression ratio and 4.12 x 3.75-inch bore x stroke, the L74’s block was drilled for four-bolt mains, but was built with two-bolt caps. Non of the late 67 to 70 high compression heads will provide the compression listed in the chiltons or factory manules, at best they where within .25 and most times where 1/2 point off. With a cam of atleast 220 [email protected]" even 9.4 comp should be ok. Are these pistons the 4 notch 12 cc type or just the 6 CC two notch type. Yes, another Pontiac 400 overheating post. I know. Sorry. But, before I begin, a few facts: I am old. I bought leaded gas. Grew up in a Pontiac family (Star Chief- grandfather, Catalina wagon - dad, 68 GTO convert, brothers, and several Grand Prix's and Firebirds). Been a car guy pretty much since the beginning. The 400 V-8 and the Firebird 400 package did continue into 1969, but the Firebird itself changed substantially enough that year to warrant its own separate consideration. . to the 10.75:1 compression ratio to the “670” heads with 2.11-inch intake valves and 1.77-inch exhaust valves, to the “067” camshaft with 273 degrees intake .
Doing a compression test, is a good way to measure the condition of, the rings, cylinders, and valves. So, if your engine is running rough or is lacking power, consider doing a compression test. Also, it is important to perform a compression test every time a tune-up is done, as part of preventative maintenance.
compression
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1969 pontiac 400 compression test|400 pontiac compression ratio