SANTANA5STAR

This motor is a ls\vtec. Everything is new and was pu together by a shop around my old neighborhood. well i ran a compression check after the motor would not start .... all wiring has been checked. all the cyclinders read below 80.
suck as 60 80 90 70. what could the problem be.... i was thinking head gasket but i am unsure

Ruben19

ii don't think is the head gasket unless they used the wrong one. did they install new valves?

SANTANA5STAR

no new valves.... it a b16 head/// the valves are not bent... when i crank the the car i get a lil backfire from the intake and a sputter here and there but no reall sign of starting

SANTANA5STAR

should my compression be reading that low since the car hasnt set the rings yet?

g230sport

sounds like possibly your timing is off, throw a timing light on it and just check that. you might be a tooth or so off on your timing belt.

Null zahlen

If you can and have the proper tools available, do a leak down test. It's much better then a compression test.

SANTANA5STAR

is that were i add a lil oil while doing a compression test or explain ?

Ruben19

that's what im thinking too.

SANTANA5STAR

that would cause me not to start???? also i am still worried about the compression lvl......... also with the timing light doesnt that require the orginal pulley?

Null zahlen

nope, the air leak down test is using air and the "air leak down tester" to pressurize the cylinder in question. Then you would need to hear where in the engine the air is leaking.

SANTANA5STAR

okay can i get a leak down tester

SANTANA5STAR

also with the car never being ran.. doesnt that mean my ring arnt sealed right now anyway.?

philafelman

ur supposed to do a compression test with the car fully warmed up and WOT while cranking...if ur car hasnt started yet, it could affect the numbers. make sure you have fuel and spark and the correct firing order.

Null zahlen

Yes, that is one of the reasons a car wouldn't start, but their are several other reason like no gas, no spark, fuel pump gone bad, etc, etc.

SANTANA5STAR

what is the correct firing order just to be sure

SANTANA5STAR

bump

philafelman

its 1-3-4-2....but i dont remember for sure where #1 is on the dizzy...i think its the lower output nearest the firewall. im sure a search would yield the answer though....probably clean the plugs off to, they might be covered in fuel by now.

Null zahlen

Here ya go.

SANTANA5STAR

well imma try everything tommrow.... hope this works out

philafelman

that pic above looks like its for a single cam....heres the b-series firing order on the dizzy with pics...

https://honda-tech.com/forums/showth...g+order+series

SANTANA5STAR

bump


for more help

waaBAAH

like stated above 3 diffrent times.. backfiring through intake sounds like eitehr firing order not correct..or timing is not dead on.

if timing is NOT dead on then you would have low compression.

also with brand new pistons and rings, i would assume a "wet" compression test would yield way better results. put about a tablespoon of oil on top of the pistons..then do a compression check if it worries you that much.

backfiring through intake is wrong firing order either by spark plugs wires in the wrong order or timing (essentially opening valves at wrong time)

jayWknight

iTrader: (3)

Did you have the pressure checked, vacuum checked and head surface decked? If the valve seats are leaking then that can a reason for the lower compression numbers. Timing belt might be off and firing order can be off as well.

philafelman

spark, firing order, fuel, and timing would be the first 4 things to check....and it takes about 5 minutes.

SANTANA5STAR

well um headgasket didnt seal porperly and the intake gasket wasnt even there!!!! i think once this is str8ten out everythin migh run right lol