Question about 1988 Suzuki Samurai

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1988 samurai 130 psi compression - is this ok

My sammy has 130 psi motor compression - is this normal -

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Checked on this....you should be up in the 170 area.

Posted on Mar 12, 2009

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199 is new and 170 is service. Make sure your valves are properly set so there's no chance of leakage.


Posted on Mar 17, 2009

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Can to tell me what compression does a 3y motor should be thank you.


Toyota mota ?

Any compression figure above about 130 psi is OK. A dead new engine might reach higher than that. Any reading below 100 psi indicates that cylinder has a problem with either rings or valve sealing.

However of far more importance is the variation between cylinders. Ideally you want no more than 10% variation (max 15%) between lowest and highest reading, for smooth running and idling. So one reading of 110 psi and the next at 150 psi still needs some further investigation, at least a repeat run.
.

Oct 10, 2016 | Cars & Trucks

1 Answer

What should the psi compression be thanks.


It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

May 17, 2016 | Cars & Trucks

1 Answer

My 1995 Lexus LS400 has 120-130 psi compression in all 8 cylinders, does anyone KNOW what factory specifications are?


1995 Lexus LS400 specifications, information, data, photos ...

www.carfolio.com/specifications/models/car/?car=23507
1995 Lexus LS400 automobile specifications & information. ... The Lexus LS400's engine is a naturally aspirated petrol, 4 litre, double overhead ... 4 valves per cylinder... bmep (brake mean effective pressure), 1171.5 kPa (169.9 psi ).

Aug 01, 2015 | Lexus Cars & Trucks

2 Answers

When doing a compression check on a 1988 Suzuki Samurai, what should it read on the compression gage?


With throttle held wide open... A good running engine should produce 140-160lb compression

Apr 25, 2015 | 1988 Suzuki Samurai

1 Answer

Big ends and main bearing torque settings


RTM

http://www.fixkick.com/sammi-stuff/index.html

Mar 06, 2014 | 1988 Suzuki Samurai

1 Answer

Big ends main bearing torque setting


you posted that 4 times.
on one post, i answered with the link to a full FSM.
the full factory manual.
here it is again.
all three chapters.
and a link there to a real sammi forum...

http://www.fixkick.com/sammi-stuff/index.html

Mar 06, 2014 | 1988 Suzuki Samurai

1 Answer

Compressions for 3.5 engine


Compression should usually run between 130-175 psi. The main thing is that there is no more than 25% difference in readings between all cylinders.

Dec 03, 2013 | 2010 Dodge Charger

1 Answer

FD42 big end torque


FD42 ?
big end? sounds, like ROD cap bolt/nut torque.
well no mater, why not read fsm, click sammi here.
http://www.fixkick.com/sammi-stuff/index.html

Nov 25, 2013 | 1988 Suzuki Samurai

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